• Journal of the Korean Wood Science and Technology
• /
• v.49 no.4
• /
• pp.360-370
• /
• 2021

For the purpose of finding new uses for Miscanthus sinensis var. purpurascens, this study first constructed boards with the particles of the plant and impregnated them with phenolic resin at resin impregnation rates of 30 ± 2%, 40 ± 2%, 50 ± 2%, and 60 ± 2%. The impregnated boards were then carbonized at the carbonization temperature of 800℃, after which their density and mechanical properties were examined according to the different resin impregnation rates. The results showed that density, flexural strength performance, Brinell hardness, and compressive strength increased as the resin impregnation rate increased, thus affecting the physical and mechanical properties of the ceramics made of M. sinensis var. purpurascens particles.

• Proceedings of the KIEE Conference
• /
• 2004.07c
• /
• pp.2006-2008
• /
• 2004

In this paper the imitated electric defect was simulated by insulation particle in the model GIS. This paper studied the distribution of frequency spectrum of the radiated electromagnetic waves using antenna (30-2,000[MHz]) and spectrum analyzer. From results of this study, a new method was introduced for measurement and analysis of the radiated electromagnetic waves in accordance with discharge progress of each defect in the model GIS. It was confirmed that detecting partial discharge and estimating discharge progress can be possible in the model GIS.

• The Journal of Korea Robotics Society
• /
• v.3 no.4
• /
• pp.308-314
• /
• 2008

Recently, simultaneous localization and mapping (SLAM) approaches employing Rao-Blackwellized particle filter (RBPF) have shown good results. However, no research is conducted to analyze the result representation of SLAM using RBPF (RBPF-SLAM) when particle diversity is preserved. After finishing the particle filtering, the results such as a map and a path are stored in the separate particles. Thus, we propose several result representations and provide the analysis of the representations. For the analysis, estimation errors and their variances, and consistency of RBPF-SLAM are dealt in this study. According to the simulation results, combining data of each particle provides the better result with high probability than using just data of a particle such as the highest weighted particle representation.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2016.02a
• /
• pp.316.1-316.1
• /
• 2016

지구 온난화로 인한 기후변화 현상이 점차 가시화 되고 있는 가운데 탄산가스를 비롯한 온실가스의 배출을 저감하기 위한 연구개발 노력과 관심이 고조되고 있다. 지구 대기층이 가지는 이러한 온실효과는 산업화 경향이 두드러지면서 화석에너지의 사용 증대 등 인위적 요인들에 의해 많이 증가하게 되었다. 온실가스 중에서 산화이질소(N2O)는 이산화탄소(CO2)와 메탄(CH4) 다음으로 많이 배출되는 성분이며 지구온난화 효과는 이산화탄소 분자의 310배에 달한다. 본 연구에서는 반도체 미세 패터닝(Pattering)에 게이트 산화막의 두께가 점차 얇아짐에 따라 발생하는 문제점을 해결하고 특성을 향상시키기 위해 사용되는 질화산화막(SiON)을 증착 시, 기존 산화이질소(N2O) 대신 산화질소(NO)를 사용하여 대체 가능 여부를 평가하고자 하였다. 본 연구에서는 산화질소(NO) 사용량의 변화를 통하여 FT-IR 및 Refractive Index 측정하면서 기존 산화이질소(N2O)를 이용하여 구현된 질화산화막 막질과 결과를 비교하였고, 질화산화막 증착율 및 파티클 발생 수준을 비교하였다.

• Journal of Korea Technical Association of The Pulp and Paper Industry
• /
• v.34 no.4
• /
• pp.7-15
• /
• 2002

It is of critical importance to understand the characteristics of papermaking additives and their reaction mechanisms to fully utilize the benefits they provide. Among the papermaking additives, retention aids play critical roles in improving productivity, product quality and process economy. Diverse research efforts to understand the reaction mechanisms between cationic polymers and anionic microparticles have been made since microparticle retention systems were introduced into the market. And it is most commonly accepted that flocs formed by the addition of cationic polymers are dispersed by shear force and the broken flocs are reflocculated instantly with the addition of microparticles. There are still many unanswered questions, however, on the reaction phenomena between cationic polymers and anionic microparticles. In this study, several cationic polymers including waxy maize starch, com starch and guar gum were used to investigate their retention efficiency when they were used along with anionic colloidal silica.

• International Journal of Highway Engineering
• /
• v.18 no.4
• /
• pp.63-68
• /
• 2016

PURPOSES : The nonlinear model of fatigue cracking is typically used for determining the maintenance period. However, this requires that the model parameters be known. In this study, the particle filter (PF) method was used to determine various statistical parameters such as the mean and standard deviation values for the nonlinear model of fatigue cracking. METHODS : The PF method was used to determine various statistical parameters for the nonlinear model of fatigue cracking, such as the mean and standard deviation. RESULTS : On comparing the values obtained using the PF method and the least square (LS) method, it was found that PF method was suitable for determining the statistical parameters to be used in the nonlinear model of fatigue cracking. CONCLUSIONS : The values obtained using the PF method were as accurate as those obtained using the LS method. Furthermore, reliability design can be applied because the statistical parameters of mean and standard deviation can be obtained through the PF method.

• Proceedings of the KIEE Conference
• /
• 2003.10a
• /
• pp.189-190
• /
• 2003

현장에서 많이 사용되고 있는 GIS에 결함이 발생하면 치명적인 사고로 진전될 수가 있다. 본 논문은 모의 GIS내 도전성 파티클 존재시 발생되는 부분방전 신호를 절연 진단 방법중 하나인 UHF법을 이용해 부분방전시 방사되는 방사전자파의 스펙트럼을 분석해 부분방전 진전과정을 판단하였다. 이러한 연구는 현장 GIS 및 $SF_6$ 가스절연 전력설비의 전기적 신뢰성 확보를 위해 UHF 법을 이용한 절연진단 시스템 개발에 중요한 역할을 할 것으로 사료된다.

• The Journal of Korea Robotics Society
• /
• v.2 no.1
• /
• pp.21-28
• /
• 2007

The Intelligent Space(ISpace) provides challenging research fields for surveillance, human-computer interfacing, networked camera conferencing, industrial monitoring or service and training applications. ISpace is the space where many intelligent devices, such as computers and sensors, are distributed. According to the cooperation of many intelligent devices, the environment, it is very important that the system knows the location information to offer the useful services. In order to achieve these goals, we present a method for representing, tracking and human following by fusing distributed multiple vision systems in ISpace, with application to pedestrian tracking in a crowd. And the article presents the integration of color distributions into particle filtering. Particle filters provide a robust tracking framework under ambiguity conditions. We propose to track the moving objects by generating hypotheses not in the image plan but on the top-view reconstruction of the scene. Comparative results on real video sequences show the advantage of our method for multi-object tracking. Also, the method is applied to the intelligent environment and its performance is verified by the experiments.

• Proceedings of the KIEE Conference
• /
• 2005.07d
• /
• pp.2796-2798
• /
• 2005

This Paper presents a method that a mobile robot can track persons in complex environment using particle filters. The topic of person following using mobile robot is researched in many different areas. The main problems of following a person are real time constraint, motion change of person during the tracking and occlusion with other objects. We present appearance adaptive models in a particle filter to realize robust visual tracking algorithm. Adaptive appearance model can handle occlusion with other people while target is moving.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
• /
• 2007.06a
• /
• pp.81-85
• /
• 2007

반도체 공정에서 식각 공정을 위한 패턴 형성 시, 현상을 위해 포토레지스트를 도포한다. 이 포토레지스트는 일정한 두께로 도포 되어야 하기 때문에 고도의 정밀성이 요구되는 공정이며, 공정 불량이 빈번하게 발생한다. 이러한 공정 불량 발생 시 현재 양산에서는 매엽식 장비로 애싱 전 처리 한 후, 약액 처리를 위해 낱장의 웨이퍼를 일정량 모아서 배치식 장비로 처리한다. 이렇게 되면 공정 불량 발생시, 약액의 소모를 줄이기 위해서는 일정량 모아질 때까지 대기하여 처리하여 시간 소모가 커지며, 시간 소모를 줄이기 위해서는 낱장으로 처리하여야 하기 때문에 약액 손실이 커져 비경제적일 수 밖에 없다. 따라서 본 연구에서는 이러한 문제점을 해결하기 위해, 매엽식 장비로 무기 용제를 이용하여 효율적으로 포토레지스트를 제거하는 방법에 대해서 평가를 실시하였다. 평가 결과 krF 포토 레지스트 웨이퍼에 대해서 완전 박리하는 결과를 얻었으며, 160nm 기준 파티클 50개 미만의 결과를 얻었다.