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- 저자 : 이행우(Haengwoo Lee) (검색결과 4 건)
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이행우,Lee, Haengwoo 디지털산업정보학회 2016 디지털산업정보학회논문지 Vol.12 No.1
This paper is on an acoustic echo canceller solving the double-talk problem by using the blind signal separation technology. The acoustic echo canceller may be deteriorated or diverged during the double-talk period. So we use the blind signal separation to detect the double talking by separating the near-end speech signal from the mixed microphone signal. The blind signal separation extracts the near-end signal from dual microphones by the iterative computations using the 2nd order statistical character in the closed reverberation environment. By this method, the acoustic echo canceller operates irrespective of the double-talking. We verified performances of the proposed acoustic echo canceller in the computer simulations. The results show that the acoustic echo canceller with this algorithm detects the double-talk periods well, and then operates stably without diverging of the coefficients after ending the double-talking. The merits are in the simplicity and stability.
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해상태양광 구성요소 개발 및 이를 기반으로하는 설계 연구
이행우(Haengwoo Lee),조경훈(Kyeonghoon Cho),김재수(Jaesu Kim) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
수상태양광발전은 제한된 국토면적 내에서 태양광발전 비율을 높이기 위해 활발히 연구되고 있는 기술이다. 최근에는 토지이용율 한계로 인해 내륙의 호수나 저수지를 넘어 해상태양광 사업의 필요성이 많이 이야기되고 있지만, 이를 위한 적절한 기술체계는 아직 성립되지 않은 상황이다. 내륙의 호수 및 저수지 등 기존 수상태양광 환경에서 해양으로 설치지역을 변경하고 대규모로 설치하게 되면, 우선적으로 파랑 하중이나 염수 내식성 등에 대한 안전성 확보가 매우 중요해진다. 수면이 비교적 안정적인 호수나 저수지와는 달리 파도에 의해 수면 위에 설치된 수상태양광이 움직이고 힘을 받게 된다. 이에 대비한 설계가 매우 중요하며, 해수의 염분에 의한 부식의 영향도 반드시 고려돼야 한다. 본 연구에서는 이를 해결하기 위한 요소기술로서 유선형 부력체, 염분에 의한 부식방지를 위한 친수성무기질 나노코팅기술과 태양광 발전량 향상을 위한 부유식 회전기술을 적용한 부유식 회전 해상태양광 발전시스템을 제시하고 실증하기위한 1단계로 3MW급 부유식 회전 해상태양광 발전시스템을 설계하였다. Floating photovoltaic (FPV) is a technology that is being actively studied to increase the rate of PV power generation within a limited land area. Recently, there has been a lot of talk about the need for Offshore FPV projects beyond inland lakes or reservoirs due to the limitation of the land use rate, but an appropriate technology system for this has not yet been established. When the installation area is changed from the existing floating PV such as inland lakes and reservoirs to the ocean and installed on a large scale, it becomes very important to first secure safety against wave load and salt water corrosion resistance. Unlike lakes or reservoirs, where the water surface is relatively stable, the floating solar power installed on the water surface moves and receives power by the waves. It is very important to design in preparation for this, and the effect of corrosion caused by salinity of seawater must also be considered. In this research, as a factor technology to solve this problem, a floating rotating offshore FPV system applied with a streamlined buoyancy body, hydrophilic inorganic nano coating technology to prevent corrosion by salt, and floating rotation technology to improve solar power generation is presented. As a first step for demonstration, a 3MW class floating rotating offshore FPV system was designed.
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전반조명 기반 사용자 및 위치인식기술 적용 조명제어 시스템 제안 연구
박주일(Juil Park),이행우(Haengwoo Lee),서장후(Janghoo Seo),김용성(Yongseong Kim) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.10
Studies for the reduction of lighting energy have been done using technologies such as user and location awareness. However, the focus of current research on location-based lighting control has been on energy reduction, which can lead to other issues including an imbalance in indoor illumination. This study proposes a lighting control system applying general illumination and technology for user and location awareness. The proposed lighting control system reduced lighting energy by 72.1%, 66.5% and 62.3% for 1, 2 and 3 users, respectively, compared to the On/Off lighting control system. This lighting control system causes an increase in lighting energy of 35.8% and 10.9% for 1 and 2 users compared to the lighting control system with user and location awareness, while a reduction of 9.4% was seen for 3 users. This means that the proposed system provides more effective energy reduction for a room with multiple occupants as it is based on the general lighting control scheme. The lighting control system applying general illumination and technology of user and location awareness improved the uniformity factor by 32.0%, 39.4% and 33.4% for 1, 2 and 3 users, respectively.
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반사판의 폭 조절이 가능한 서랍형 타입의 가동형 광선반 개발 연구
김다솜(Dasom Kim),이행우(Haengwoo Lee),서장후(Janghoo Seo),김용성(Yongseong Kim) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.9
Due to the recent increase in lighting energy consumption in buildings, there are a growing number of studies seeking solutions this problem. The effectiveness of light-shelves as natural lighting systems to solve this problem has been recognized, and various studies regarding such systems are being carried out currently. However, the lighting efficiency of light-shelves decreases if illumination intensity is low-such as at night time, and it also obstructs the views of building occupants. Therefore, the purpose of this study is to examine a movable drawer type light-shelf which allows for the width of the reflector to be adjusted and verify its performance through a simulated test-bed. The following conclusions were reached. 1) The purpose of this study is to solve the problem previously associated with the light-shelf system- of obstructed views-by responding to external environments and minimizing the width of the light-shelf at night time when the efficiency of the light-shelf declines. 2) The proper variables of the movable drawer type light-shelf which enables the width adjustment of the reflector were ascertained in this study according to four solar terms : a width of 0.6 m at an angle of 20°, a width of 0.4m with an angle of 20°, and a width of 0.1 m with an angle of 20° were determined for the summer solstice, fall/spring equinoxes, and winter solstice respectively; revealing that width adjustment of the light-shelf is a significant factor. 3) The movable drawer type light-shelf which enables\width adjustment of the reflector suggested in this study can reduce the lighting energy consumption by 18.7% and 14.3% in comparison to previous light-shelves with a fixed width of 0.3 m and 0.6m, indicating that it is effective for saving energy.
ScienceON
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