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양용주(Yongju Yang),윤영로(Youngro Yoon) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
Ubiquitous Location Based Services (u-LBS) will soon be able to issue very important services. They can define that recognizing object position at anytime, anywhere. At present, many researchers are making a brisk study of the position recognition and tracking. This paper is position recognition monitoring and user identification system. Position recognition monitoring is based on Local Based Services (LBS). User identification system automatically controls instruments which is located in home and freely measures body signal. We experiment at Home Health Management trial laboratory in YONSEI University. We implemented multi-hop routing methods using the Star-Mesh networks. Also, we use the sensor devices which are satisfied with the IEEE 802.15.4 standard requirements. Used devices are Nano-24 modules in Octacomm Co. Received Signal Strength Indicator (RSSI) is very important factor in position recognition analysis. it makes use of the way that decides position recognition and user identification in narrow indoor space. In experiments, we can analyze properties of the RSSI and draw the parameter about position recognition. Experimental results are that RSSI value is attenuated according to increasing distances and it can derive properties of the Radio Frequency (RF) signals. Moreover, we express monitoring program using Microsoft C#. Finally, the proposed methods are expected to protect sudden death and accident in home.
윤소남(Sonam Yun),류재섭(Jaeseop Ryu),안병규(Byoungkyu Ahn),함영복(Youngbok Ham),양용주(Yongju Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, the digital pilot actuator with a solenoid for high-voltage circuit breaker was studied. The solenoid is made of a soft magnetic iron bar with a large number of coil windings. when an electric current passes through this, this stationary core becomes the strong magnet used for hydraulic and pneumatic valve of a solenoid operated valve. For the performance evaluation of the solenoid for high-voltage circuit breaker, electromagnetic characteristics and dynamic characteristics were analyzed. And, the parameters which is related to performance improvement were investigated. From the experiment of a digital pilot actuator, it was confirmed that time constant of a solenoid is 7㎳ and digital pilot actuator is 54㎳.