• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.4
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• pp.820-828
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• 2017

Service of digital hologram that has been recognized as a visual system for next generation requires various signal processing technologies. A transform is the most frequently used tool among signal processing techniques for 2-dimensional(D) and 3-D natural picture. A digital hologram has totally different property with a natural picture, so it is rarely efficient to apply transform tools used in 2-D image processing to a digital hologram. To overcome this a Fresnelet transform for a digital hologram has been proposed. We derive a Fresnelet transform by using the Daubechie's filter after applying an unitary Fresnel transform to a wavelet basis function. We also implement the transform as types of device and kernel code to improve operational performance. In consideration of the average time that is required for a pixel we can have observed the performance is improved up to 242 and 30 times for using the (9,7) and (5,3) filters in case of using device code.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.3
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• pp.91-101
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• 2013

This paper proposes a new re-coloring method for the people with the red-green color vision deficiency (CVD). These people have difficulty in discriminating the red and green colors since they abnormally perceive the hue and luminance value of the colors. We introduce a color transformation that adjusts the hue and luminance value in HSV color space. The color transformation is determined according to the severity of CVD. Our aim is to maintain the color differences in original image while maintaining the recolored image to be natural to the people with normal color vision. Experimental results show that the proposed method can yield more comprehensible images for the people with red-green CVD while maintaining the naturalness of the recolored images.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.11
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• pp.2136-2149
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• 1992

The natural convection from an inclined ice flat plate immersed in cold water near its density maximum is studied numerically. Finite difference analysis has been performed for the heat and momentum transfer with respect to various inclined angles and ambient water temperatures. The results of the analysis are presented for ambient water temperatures, 1.0deg. C. leq. T／sub .inf.／.leq. 15.0deg. C and the inclined anales from 0deg to 60deg. They include velocity profiles, temperature profiles, melting velocities, and mean Nusselt numbers for entire flow fields, Generally, in the range of 0deg. C .leq.theta. .leq. 60.deg. C, the results show three distinct flow regimes, In the range of 1.0 deg. C .leq. T／sub .inf.／ .leq. 4.6 .deg. C, the greatest mean Nuselt number exists about 3.0deg. C. In the range of 5.7deg. C .leq. T／sub .inf.／ .leq. 15.0deg. C, mean Nuselt number increases as ambient water temperature increases. Also, the mean Nuselt number decreases as the inclined angle increases. This theoretical results are compared with previous experimental ones and multiple steady state ones.

• The Journal of Natural Sciences
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• v.9 no.1
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• pp.131-143
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• 1997

The authors studied clothing buying motive and clothing buying behavior. The date were obtained from 352 women college students living in Seoul and Taejon. As the result of factor analysis. four buying motive factors were found: fashion and individuality, economy, status, advertising and impulsive buying. Three buying behaviors(information using, clothing selection standard, and shop selection standard) were factor analyzed. Three factors were founded in information using: human, electric wave communication, advertising and observation factors. Four factors were found in clothing selection standard: utility, design, marketing, fashion and status. Two factors were found in shop selection standard: merchandise and service. Clothing buying motive and clothing buying behavior were related, and they were different according to the levels of spending money and major in college.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1997.11a
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• pp.145-159
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• 1997

Cheju Island is the most attractive resort area in Korea for its exotic landscape, natural beauty, and traditional culture which is quite different from that of the mainland. Until now, most of the recreational facilities and accomodations have been constructed along the coastal areas. Recently, mid-mountain area has been under very heavy development pressure because it is suitable for new sites for tourism facilities and the land price in the coastal area is very high. The mid-mountain area is the land located 200-600m above the sea level. It is a major source of water supply for the island and has exotic scenic beauty, which cannot be found in mainland but it is the area very vulnerable to water pollution Therefore, it is very important to manage this area based on the concept of environmentally sound and sustainable development in order to meet ever increasing demand for the land development The purposes of this project are: 1) to establish Geographic Information System for the whole island, 2)to formulate environmentally sound landuse plat However, There has been accuracy of the original map, defining criteria of analysis, updating of the data were identified for future tasks to be studied.

• The Journal of the Acoustical Society of Korea
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• v.20 no.5
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• pp.35-47
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• 2001

This paper describes an efficient harmonic-CELP speech coder by taking advantages of harmonic and CELP coders into account. According to frame voicing decision, the proposed harmonic-CELP coder adopts the RP-VSELP coder as a fast CELP in case of an unvoiced frame, or an improved harmonic coder in case of a voiced frame. The proposed coder has main features as follows: simple pitch detection, fast harmonic estimation, variable dimension harmonic vector quantization, perceptual weighting reflecting frequency resolution, fast harmonic synthesis, naturalness control using band voicing, and multi-mode. These features make the proposed coder require very low complexity, compared with HVXC coder To demonstrate the performance of the proposed coder, a 2.4 kbps coder has been implemented and compared with reference coders. From results of informal listening tests, the proposed coder showed good quality while requiring low delay and complexity.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.146.2-146.2
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• 2014

KIST 6MV 가속기는 이온빔 분석 그리고 가속기 질량 분석법(Accelerator mass spectrometry)으로 활용된다. 이온빔 분석으로는 RBS, TOF ERD, PIXE. ${\mu}$-Probe을 할 수 있으며 AMS(Accelerator mass spectrometry)는 액체섬광측정법(LSC)과 비교할때 민감도는 1,000배 정도로 3H, 14C, 26Al,41Ca 을 10-21 ~ 10-18 mole/mg 까지 검출 가능하여. 응용분야로는 BAMS(Biological AMS), 전통과학, 지구과학, 환경과학에 활용되고 있다. 이중 AMS의 생-의학분야(BAMS)의 응용은 최근 매우 중요하게 연구되고 있다. BAMS의 활용 연구에 사용하는 핵종으로는 주로 3H, 14C, 41Ca, 36Cl를 사용하며, 14C 화합물은 쉽게 구할 수 있고, 자연방사선 이하의 낮은 14C labeled drug 사용하기 때문에 1948년 이후 생물학 연구에 혁신적으로 활용되고 있다. 주 활용분야로는 (1) 신약개발은 임상실험 전(Phase 0) 이용되며, 14C로 표지된 bio-molecule을 자연수준의 방사선 농도에서 추적자로 사용하여 질량을 측정하는 방법을 활용. (2) 의과학분야는 인체 내에서의 추적자 연구수행 (3) 항암제 연구는 암조직 중 약물농도와 암효과의 상관성을 연구 (4) 바이오 기술 분야에서는 생약 유효물질의 체내 대사연구 등을 할 수 있어 전세계적으로 활발히 연구가 진행되고 있다. KIST에서는 6MV가속기를 BAMS 연구에 활용하기 위하여 전처리 단계의 Combustion, Gas transfer, Reduction 등을 자체 제작하여 테스트 중에 있으며, BAMS 샘플의 Gas는 호기중의 성분, 대기 성분이 있으며, Liquid는 혈액(혈장,혈청,적혈구), Solid는 DNA, 세포, 장기 뼈, 피부, 식물조직, 사료, Drug 및 그 대사 류가 있다. AMS 측정 결과는 14C/12C 비율로 나타나며 그 결과를 농도로 환산하여 분석하게 된다. 또한 분석 데이터 신뢰를 확보하기 위하여 표준시료 및 품질관리용 시료를 사용하여 BAMS분석법에 대한 검증을 실시하였다.

• Journal of the Korean Institute of Landscape Architecture
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• v.29 no.3
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• pp.46-54
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• 2001

도시녹지 면적 확대의 해결책으로 부각되고 있는 옥상정원은 조성이 용이해야 하며, 옥상정원 조성에 있어 가장 문제시되는 하중 또한 고려되어야 한다. 이러한 문제들로 인해 최근 경량 인공토양의 이용 필요성이 부각되고 있으나, 자연토양에 비해 고가(高價)라는 이유로 자연토양이 주로 이용되거나, 인공토양이 이용되더라도 대부분 무기질계 단종(斷種) 인공토양만으로 시공되고 있어 식물 생육측면에서 단점 보완이 요구되고 있다. 따라서, 본 연구는 옥상정원 조성에 이용 가능한 유·무기질계 인공토양들을 혼합 조성하여 그 물리·화학적 특성을 살펴보고, 각각의 혼합 인공토양 및 토심에 따른 식물생육을 조사해 봄으로써 이용 가능성을 살펴보았다. 12종류의 혼합 경량 인공토양 및 5종류의 토심(5, 10, 20, 30cm)으로 조성된 인공지방산에 2000년 6월 7일 비비추(Hosta longipes)를 정식하였으며, 정식 112일 후에 최종 생육조사를 실시하였다. 혼합 경량 인공 토양 및 토심에 따른 토양의 물리 화학성은 인공토양 분석법을 기초로 조사 분석하였다. 그 결과, 1) 질석;피트모스(1:1, v/v), 펄라이트:질석:피트모스(1:1:2, v/v/v), 펄라이트;피트모스;입상암면(1:1:1, v/v/v) 혼합 경량 인공토양에서 비비추의 생육이 가장 좋았으며, 물리·화학성도 다른 토양에 비해 양호하였고, 하중도 적게 측정되었다. 2) 토심에 따른 비비추의 생육에서는 토심 10∼20cm에서 유의적인 차이를 보이지 않아, 토심 10cm에서도 자생 초화류의 생육이 가능할 것으로 판단되었다. 3)또한 인공토양의 물리·화학적 특성과 식물 생육(생체중)과의 상관관계를 조사한 결과 전기전도도(EC), Na함량 및 토양표면 온도가 식물 생육에 있어 다른 요인들에 비해 더 큰 영향을 끼침을 살펴볼 수 있었다. 위의 결과들을 살펴볼 때 혼합 경량 인공토양은 토심을 낮추어 하중을 감소시킬 수 있을 뿐 아니라 식물 생육측면에서도 긍정적인 효과를 나타내 기존 건물의 옥상정원에서도 이용이 가능할 것으로 보인다. 그러나 본 실험에서는 더 나아가 저장기적인 혼합 인공토양의 물리·화학성 변화 및 식물생육을 살펴보는 연구 또한 이루어져야 할 것으로 생각된다.

• Geophysics and Geophysical Exploration
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• v.1 no.2
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• pp.110-115
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• 1998

Self-potential, VLF-EM and dipole-dipole resistivity methods have been widely used for exploration of conductive sulfide ore deposit, because of the convenience and low cost of field work and the reliability of their results. The geophysical responses for vein-type sulfide outcrop of Changkoom mine located in Bukwi-Myon, Jinan-Gun, Chollabuk-Do were investigated and compared with its drilling results. The geology around the survey area is composed of acidic volcanics and sediments of Yuchon Group. And sulfides bearing pyrite, pyrrotite, galena etc. are deposited in disseminated or vein type within acidic volcanics. Typical geophysical responses were detected from the above vein type ore body, respectively. From the shape and extent of S.P. anomaly, ore body is dipping westward and extending about 50 m. It is detected that the VLF EM response matching the outline of ore zone is considered as indication of dyke dipping westward. And also resistivity response indicating conductive dipping dyke is detected. From drilling results for outcrop and geophysical anomalies, the shape of ore body is vein type dipping about $70^{\circ}W$ and extending about 50 m.

• Solar Energy
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• v.19 no.3
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• pp.29-41
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• 1999

Three-dimensional natural convective heat transfer in a vertical channel with a protruding single module was investigated experimentally. The particular interest was in the removal of thermal energy from the module by convective heat transfer. Hence radiative and conductive heat losses were estimated by using thermocouples and heat flux sensor respectively. The flow fields in the channel were visualized by means of a smoke-method. Also, local temperatures were measured by thermocouples inside the channel, along the vertical wall and module surface. It is found that convective heat transfer was promoted at the lower comer of the module and was decreased at the upper comer due to a recirculation zone. A general correlation of the critical channel ratios was found as a function of Rayleigh number. For the range of $8.28{\times}10^3<Ra^*_c<3.48{\times}10^6$, a useful correlation for the mean Nusselt number was proposed as a function of modified channel Rayleigh number.