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최적화 기법을 이용한 FPSO 상부 구조 모듈의 배치 방법 연구
정세용(Se-Yong Jeong),노명일(Myung-Il Roh),신현경(Hyun-Kyoung Shin) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
A layout of a FPSO should be elaborately determined as compared with that of an onshore plant because many topside process systems are installed on the limited area; the deck of the FPSO. In this study, a layout for the topside modules was determined by using the optimization technique. For this, an optimization problem for the topside layout was mathematically formulated. The problem consists of 252 design variables representing the positions of topside process systems, 53 equality constraints and 144 inequality constraints representing limitations on the layout of them, and an objective function representing the total layout cost. To solve the problem, a hybrid optimization method that consists of the genetic algorithm(GA) and sequential quadratic programming(SQP) was used in this study. As a result, we can obtain a layout for the topside modules of the FPSO which satisfies all constraints related to limitations on the layout.
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.
정세용(Se-Yong Jeong),노명일(Myung-Il Roh),신현경(Hyun-Kyoung Shin),하솔(Sol Ha),구남국(Nam-Kug Ku) (사)한국CDE학회 2013 한국CDE학회 논문집 Vol.18 No.6
In the case of a floating offshore structure such as FPSO(Floating, Production, Storage, and Offloading unit), many equipment should be installed in the limited space, as compared with an onshore structure. Recently, the requirement for an optimal layout method of the structure has been raised. Thus, a layout method of the floating offshore structure was proposed in this study. First, an optimization problem for layout design was mathematically formulated, and then an optimization algorithm was implemented based on the genetic algorithm in order to solve it. To evaluate the applicability of the proposed method, it was applied to examples ofFPSO topsides and an offshore wind turbine. As a result, it was shown that the proposed method can be applied to layout design of the floating offshore structure.
Raspberry pi와 Application의 socket 통신을 이용한 스마트 부재중 안내판 구현
정세연(Se-Yeon Jeong),이범식,권구락(Goo-Rak Kwon) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1
본 논문은 일상생활에서 쉽게 사용하는 부재중 안내판을 보다 스마트하게 사용 할 수 있도록 도와주고 사용자에게 일주일의 일정을 간편하게 Application으로 입력하여 변동할 수 있고 시간에 맞게 변경할 수 있다. 스마트 부재중 안내판은 Raspberry pi를 기반으로 python 코드로 작성되어 진다. 먼저 android studio로 로그인창을 비롯한 일주일간의 일정을 입력할 수 있는 Application을 제작한다. Raspberry pi에서는 사용자가 보낸 데이터를 정수형 배열화 하여 각 시간대에 맞게 매핑될 수 있도록 코딩한다. 각 시간대에 맞춰 데이터값을 확인하여 데이터값과 매칭되는 이미지를 출력하여 사용자의 편의를 제공한다. 제안된 시스템은 PIR센서를 사용하여 부재중 안내판의 기능뿐만 아니라 디지털 액자의 기능도 수행할 수 있다.
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.