• The Plant Pathology Journal
• /
• v.21 no.2
• /
• pp.172-173
• /
• 2005

Until now, occurrence of Rice black-streaked dwarf virus (RBSDV) is observed in Gyeongsang provinces, southeastern part of Korea. However, recently, the occurrence of RBSDV is increasing and spreading in Jeonra provinces including Gochang-gun, southwestern part of Korea. RBSDV infected plants showed typical symptoms including stunted, deformed leaves with white waxy or black-streaked swelling along the veins. We extracted viral genomic dsRNA from infected leaves and analyzed dsRNA pattern by polyacrylamide gel electrophoresis. Ten genomic segments with similar sized dsRNAs were observed. We also detected RBSDV by reverse transcription (RT)-PCR using specific primers for S10 from genomic dsRNA and observed amplified DNA fragment specific for RBSDV S10.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2003.06a
• /
• pp.46-49
• /
• 2003

Microsystem technology (MST) which originated from semiconductor processes has been widely spreaded into tile other industry such as sensors, micro fluidics and displays. The MST, however. has been troubled in spreading with its high cost and material limitations. So, in this paper, new process for micromolding technology using silicone rubber mold was introduced. Silicone rubber mold, which was fabricated by vacuum casting. can be transferred a master pattern to a final product with the same shape but different materials. In order to verify the possibility of application of silicone rubber mold to the MST, its transferability was evaluated. and then it applied to the fabrications of polishing pad and PDP barrier ribs.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.27 no.8
• /
• pp.1380-1387
• /
• 2003

Microsystem technology (MST) which originated from semiconductor processes has been widely spreaded into the other industry such as sensors, micro fluidics and displays. The MST, however, has been troubled in spreading with its high cost and material limitations. So, in this paper, new process for micromolding technology using silicone rubber mold was introduced. Silicone rubber mold, which was fabricated by vacuum casting, can be transferred a master pattern to a final product with the same shape but different materials. In order to verify the possibility of application of silicone rubber mold to the MST, its transferability was evaluated, and then it applied to the fabrications of polishing pad and PDP barrier ribs.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.15 no.6
• /
• pp.494-505
• /
• 1990

This paper reports on the development of a DPSK demodulator of DS spread spectrum communications that use one SAW convolver. The spreading code chip pattern is changed from bit to bit in data portion of packet. And code chip is PSK modulated. Compared with simulation, experiment shows that the DPSK signal spreaded can be demodulated by using only one SAW convolver. And the theoretical performance of this DPSK demudulator is equal to CSK demodulator wich uses two SAW convolvers.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2000.10a
• /
• pp.543-546
• /
• 2000

최근 반복적 설계에 대한 해결방안으로 제시되고 있는 디자인패턴을 체계적으로 분류, 공유하여 사용하려는 연구가 진행되고 있으나, 시스템 설계자 개개인이 제시한 패턴은 공유 대상에서 제외되고 있다. 또한, 특정 CASE 도구를 사용하여 모델링한 구조는 컴포넌트화되더라도 특정 도구나 플랫폼에 독립적으로 사용될 수 없었다. 본 논문에서는 기존 디자인패턴뿐만 아니라 사용자들에 의해 새로이 제시된 패턴을 모델링하는 패턴 에디터를 이용하여 설계정보를 도구와 플랫폼에 독립적인 XML코드로 컴포넌트화 할 수 있는 XML 기반의 디자인패턴 관리시스템을 설계, 구현하였으며, 효과적인 패턴 검색을 위해 Spreading Activation 검색 방법을 사용하였다.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2005.11a
• /
• pp.201-205
• /
• 2005

With rapid urbanization, various problems have been occurred in the city. The most serious one is dwelling. The gap of income between the rich and the poor resulted in deteriorating the pattern of the house consume. In case of developing a bad residential area, this area is changed into a new residential area, but the dweller, who lived in the bad area, may move into the outskirts of the city. This means that a bad residential area is sprawled and spreading. Therefore. the rescue plan of the existing dweller according to urban redevelopment were suggested in this study.

• Proceedings of the KIEE Conference
• /
• 2000.07c
• /
• pp.1903-1905
• /
• 2000

Power transformers have a tendency of ultra-high voltage capacity as power demand increases day after day KEPCO also will have plan to supply transmission power from 345KV to 765KV in the early of 2000. Therefore, the fault by insulation destruction gives rise to large area of power failure in huge capacity transformers. On-line predictive diagnostics is very important in power transformers because of economic loss and its spreading effect. This study presents the algorithm for transformer oil analysis used KEPCO code, IEC code, gas pattern method and Dornenburg & Roger Ratio method. We also describe the MMI display of expert system programmed by Element Expert Tool(Neuron Data Inc.).

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 1997.11a
• /
• pp.456-463
• /
• 1997

Atrium buildings are commonly found in Hong Kong since 1980. Those spaces are usually crowded with people and so fire protection systems have to be installed for providing a safe environment. Smoke control system was identified to be important but no clear design guidelines are available because the smoke filling process was not well-understood. In this paper., Computational Fluid Dynamics(CFD) or fire field model is applied to study the smoke filling pattern in atrium. Two common cases on smoke spreading out from a shop adjacent to the atrium; and with a fire located at the atrium floor itself were considered. Simulations with a modified form of the CFD package TEAM were performed. Application of the predicted results Is illustrated.

• Current Optics and Photonics
• /
• v.5 no.5
• /
• pp.506-513
• /
• 2021

An arrayed diffractive optical element design for the beam-shaping of a multi-array light source is proposed. This is an essential device for recent optical security and face recognition applications. In practice, we devise a DC noise reduction technique featuring high fabrication error tolerance regarding the multi-array light source diffractive optical elements, as a necessary part of the proposed design method. The spherical diverging illumination leads to DC-conjugate noise spreading. The main idea is tested experimentally, and the multi-array light source diffraction pattern is investigated numerically.

• The Journal of the Acoustical Society of Korea
• /
• v.19 no.2
• /
• pp.46-53
• /
• 2000

In coastal bay waters, bubbles are generated by relatively heavy ship-traffic, breaking waves due to man-made structures and biological activities. Therefore, the bubble-generating mechanism as well as the bubble density distribution in the bay are quite different from the open ocean where breaking waves are major contributor for bubble density distribution. High frequency surface-backscattered signals were obtained in the coastal bay waters and they were analyzed to compare with those from the open waters in terms of the sea-surface backscattering strength at various grazing angles, the reverberation characteristics in the sub-surface layer and spectral spreading of the scattered signals. The results show that, the surface scattered signals have an irregular distribution of amplitude in time and the width of the spectral spreading is wider than that of the open sea with rough surface. Furthermore, the amplitude distribution of the reverberation signals is not following the Rayleigh distribution, that is eon to be a typical pattern for the open ocean. The results of our analysis imply that the bubble size and the bubble density in the bay are quite different from those observed in the open waters.