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우수창(Suchang Woo),변상선(Sangseon Byun),유혁(Hyuck Yoo) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2D
WPAN(Wireless Personal Area Network)은 NEMO(Network Mobility) 환경에서 모바일 네트워크의 좋은 예가 될 수 있다. 특히, Piconet은 WPAN의 전형적인 형태이다. 이러한 Piconet의 모바일 디바이스는 배터리에 의해 전력을 공급받기 때문에 제한적인 에너지를 효율적으로 이용하는 것이 중요한 문제가 될 수 있다. 우리는 이 논문을 통해 Piconet이 모바일 네트워크를 형성할 때 에너지를 효율적으로 사용하기 위한 방법을 제시한다. 이를 위해 우리는 에너지 모델을 제시하고, Piconet 단위의 모바일 네트워크에서 Scatternet 형성을 통해 새로운 경로를 생성하여 전체 네트워크의 에너지 소비를 줄일 수 있음을 보인다.
우수창(S.C. Woo),김문생(M.S. Kim),신형섭(H.S. Shin) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Brittle materials are very weak for impact because of typical characteristics which happen to be easily fractured with low fracture toughness and crack sensitivity. When brittle materials are subjected to impact due to small spheres, high contact pressure is occurred to impact surface and then local damage on specimen is developed, since there are little plastic deformations due to contact pressure compared to metals. This local damage is a dangerous factor which gives rise to final fracture of structures. In this research, the crack propagation process of soda lime glass by impact of small sphere is explained and the effects of the constraint conditions of impact spheres and materials for the material damage were studied by using soda-lime glass, that is the effects for the materials and sizes of impact ball and thickness of specimen. Especially, this research has focused on the damage behavior of ring crack, cone crack and several kinds of cracks.
RFID 물류창고 시스템을 위한 애드 혹 라우팅 프로토콜에 관한 연구
우수창 ( Su-chang Woo ),이신형 ( Shin-hyoung Lee ),유혁 ( Hyuck Yoo ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.2
RFID 기술은 직접 접촉하거나 가시대역 상에 스캐닝을 할 필요가 없는 장점 때문에 다양한 분야에 활용되고 있으며, 특히 유통·물류분야에 부각을 나타내고 있다. 본 논문에서는 대표적인 애드혹 라우팅 프로토콜인 DSR, AODV, CBRP, DSDV 의 특성을 간략히 살펴 본 후, RFID 를 기반으로 하는 물류창고 시스템의 특성을 반영하여, 앞서 언급한 라우팅 프로토콜들을 서로 비교하고, 장단점을 찾아본다.
김문생,신형섭,이현철,우수창,Kim, Mun-Saeng,Sin, Hyeong-Seop,Lee, Hyeon-Cheol,U, Su-Chang 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.1
Brittle materials such as ceramics and glasses show fragile fracture due to the low toughness and the crack sensitivity. When brittle materials are subjected to impact loading by small spheres, high contact pressure occurs to the surface of the specimen. Local damage is subsequently generated in the specimen. This local damage is a dangerous factor which gives rise to the final fracture of structures. In this research, impact damage of soda-lime glass plates by small spheres was evaluated by considering the effects of impact directions of indenter, pressure condition of specimen and residual strength after impact loading.
원거리 오염원 자동 감지를 통한 공기청정기 기류 제어방법 및 효과
박동률(Dong Ryul Park),최지은(Ji Eun Choi),백상균(Sang Kyun Baek),우수창(Soo Chang Woo),박형호(Hyung Ho Park) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Indoor air pollution may occur due to various activities indoors. The distribution of indoor dust concentration is affected by pollution sources, outside air, and activities of occupants. Even in the same space, the distribution of contamination concentration by fine particles may vary depending on the location of the pollutant and the occupancy activity. In this study, we propose a method to control the cleanliness of the polluted location through the interlocking control of the air quality sensor and the air purifier using UWB communication. Using an air purifier capable of controlling the air volume and direction of the discharged air flow, a control method for controlling the clean air flow directed to the pollution source was proposed, and the cleaning effect at the location of the pollution was verified.
차압센서를 활용한 공기청정기 필터상태 감지 정확도 평가
박동률(Dong Ryul Park),노진희(Jin Hee Noh),백상균(Sang Kyun Baek),우수창(Soo Chang Woo),박형호(Hyung Ho Park) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This study proposes a method of calculating the replacement cycle that can accurately inform the filter replacement time by reflecting the influence of the use environment in the correlation between the accumulated amount of filter dust and the air volume reduction through air volume detection through the differential pressure sensor. The differential pressure sensor is installed between the filter and the fan inside the air purifier to measure the air volume of the air purifier. The air volume was measured under the same conditions as the measurement case through the differential pressure sensor in the suction-type medium-sized fan tester. Through the comparison of the air volume detection method, it was confirmed that even with the differential pressure sensor installed in the product, it was possible to notify the filter status by accurately calculating the air volume with an error within 10%.