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Semi Yu,Enkhzaya Davaa,Gyeong-Rok Lee,Eun Joo Lee,Jeong-Sook Park 충남대학교 약학대학 의약품개발연구소 2012 藥學論文集 Vol.27 No.-
The objective of this study was to validate a reliable analytical method for the determination of rosiglitazone in human plasma by a semi-micro high performance liquid chromatography (HPLC) system with UV detection. Rosiglitazone was dissolved in methanol. Separation was performed on a SPcolumn C18 UG120 (4.6 mm × 150 mm) using mobile phase of acetonitrile, methanol and acetate buffer (pH 4.0) at a volume ratio of 20:10:70. The signals were monitored by UV detector at 214 nm with flow-rate of 1 ml/min. The intra- and inter-day precision expressed as the relative standard deviation was less than 15%. The retention time of rosiglitazone was 7.6 min. The detection limit of rosiglitazone in human plasma was 2 μg/ml and the limit of quantification was 5 μg/ml. The calibration curve was linear in the concentration range of 5~100 μg/ml (r2=0.999). The accuracy was from 1.0% to 13.5% while the intra-day and inter-day coefficient of variation of the same concentration range was less than 15%. This analytical method should be improved to be applied to determine rosiglitazone in human plasma.
A Study on 3D Locomotion of Intravascular Therapeutic Microrobot using EMA System
Semi Jeong,Hyunchul Choi,Cheong Lee,Kiduk Kwon,Gwangjun Go,Doo Sun Sim,Kyung Seob Lim,Myung Ho Jeong,Seong Young Ko,Jong-oh Park,Sukho Park 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper, we proposed an intravascular microrobot using an EMA system with bi-plane X-ray fluoroscopy. The proposed EMA system consists of a pair of stationary Helmholtz-Maxwell coils in x-axis and a pair of rotational uniform-gradient saddle coils on x-axis. The microrobot using the EMA system can be aligned to the desired direction by the uniform magnetic field from the Helmholtz-uniform saddle coil pairs and can be propelled to the aligned direction by the uniform gradient magnetic field from the Maxwell-gradient saddle coil pairs. Based on this actuating principle, we developed the microrobot which can move and have a treatment function in blood vessel. For the position recognition of the microrobot, a bi-plane X-ray fluoroscopy was installed in the EMA system. The bi-plane X-ray fluoroscopy can provide frontal and lateral views of mini-pig and the image of the microrobot. In addition, the bi-plane X-ray fluoroscopy can be rotated together with the pair of rotational uniform-gradient saddle coils on x-axis. Through various in-vitro and in-vivo experiments, we could verify the feasibility of the proposed intravascular therapeutic microrobot.
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.
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.
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.