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EMA System을 이용한 마이크로로봇의 3차원 구동에 관한 연구
정세미(Semi Jeong),최현철(Hyunchul Choi),최종호(Jongho Choi),박석호(Sukho Park),박종오(Jongoh Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
For treatment of cardiovascular disease and drug delivery, the locomotion mechanisms of microrobot have been studied. However, by the restriction of integration of rnicrorobot such as actuation part, sensing module and treatment tool, the development of microrobot is very difficult. For solving this problem, we propose a new electromagnetic actuation (EMA) system which can produce external actuation force by electromagnet field. In 3 dimensional (D) spaces, the EMA system is able to align microrobot to the desired direction and propels microrobot to the aligned direction. The proposed EMA system consists of a stationary Helmholtz-Maxwell coils pairs and a rotational Helmholtz-Maxwell coils pairs. For 3D locomotion of microrobot, two Helmholtz coils pair can magnetize and align the microrobot to desired direction and two Maxwell coils pair can produce propulsion force to microrobot. For the detailed actuation of microrobot in 3D space, the gravitational force of microrobot can be compensated. Finally, the performances of the proposed EMA system ware validated by various experiments.
정세미(Semi Jeong),최종호(Jongho Choi),박종오(Jongoh Park),박석호(Sukho Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This paper deals with a study and development of the flower robot among service robots, which has the functions of interior and robotic movements. The proposed flower robot consists of flower, stem and leaves, which are actuated by the tendon mechanism. The flower, stem and leaves structures are integrated and controlled as one flower robot. For the control, we used dSPACE system and Simulink of MATLAB. From the development of the flower robot, we mimic the blooming of the flower, the swaying of the stem, and the stirring of the leaves, respectively, and can fabricate the sensor integrated robotic flower robot.
에너지 수집형 노드를 사용한 무선 센서 네트워크에서의 적응형 데이터 병합 및 압축 기법
정세미(Semi Jeong),김혁(Hyeok Kim),노동건(Dong Kun Noh),윤익준(Ikjune Yoon) 한국컴퓨터정보학회 2017 韓國컴퓨터情報學會論文誌 Vol.22 No.3
In this paper, we propose an adaptive data aggregation and compression scheme for wireless sensor networks with energy-harvesting nodes, which increases the amount of data arrived at the sink node by efficient use of the harvested energy. In energy-harvesting wireless sensor networks, sensor nodes can have more than necessary energy because they harvest energy from environments continuously. In the proposed scheme, when a node judges that there is surplus energy by estimating its residual energy, the node compresses and transmits the aggregated data so far. Conversely, if the residual energy is estimated to be depleted, the node turns off its transceiver and collects only its own sensory data to reduce its energy consumption. As a result, this scheme increases the amount of data collected at the sink node by preventing the blackout of relay nodes and facilitating data transmission. Through simulation, we show that the proposed scheme suppresses the occurrence of blackout nodes and collect the largest amount of data at the sink node compared to previous schemes.
에너지 수집형 무선 센서 네트워크에서 선택적 데이터 압축을 통한 동적 센싱 주기 제어 기법
윤익준,이준민,정세미,전준민,노동건,Yoon, Ikjune,Yi, Jun Min,Jeong, Semi,Jeon, Joonmin,Noh, Dong Kun 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.2
In wireless sensor networks, increasing the sensing rate of each node to improve the data accuracy usually incurs a decrease of network lifetime. In this study, an energy-adaptive data compression scheme is proposed to efficiently control the sensing rate in an energy-harvesting wireless sensor network (WSN). In the proposed scheme, by utilizing the surplus energy effectively for the data compression, each node can increase the sensing rate without any rise of blackout time. Simulation result verifies that the proposed scheme gathers more amount of sensory data per unit time with lower number of blackout nodes than the other compression schemes for WSN.
조재성 ( Jaesung Cho ),정세미 ( Semi Jeong ),배지윤 ( Baeji Yoon ),지인배 ( Inbae Ji ) 한국축산경영학회,농업정책학회(구 한국축산경영학회) 2018 농업경영정책연구 Vol.45 No.2
In Korea, the farm gate price of raw milk is determined by the price formula based on milk production cost. Total raw milk production at the national level is also heavily limited by the national quota system. Therefore, it is almost impossible to understand the status of raw milk market by observing raw milk price at the farm level or total supply of raw milk. This study develops an index to measure the imbalance of supply and demand of raw milk. To do this, we first analyzed the structure of raw milk market and then developed the milk market pressure index by applying the structure of the foreign exchange market pressure index. In addition, this study sets the seven market crisis stages using the average and standard deviation of the milk market pressure index and analyzed the main causes of the market crisis.