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Development of ultracapacitor management system controller for solar-powered streetlamp
Danielle Jaye S. Agron(다니),Henar Mike O. Canilang(헤나르),Angela Caliwag(안젤라),Wansu Lim(임완수) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
In this paper, an ultra-capacitor management system (UCMS) controller for solar-powered streetlamp is developed. To increase the efficiency and deployment life of the ultra-capacitor, an active balancing scheme has been applied for the charging and discharging phase. Through the balancing approach, an active charge and discharge protection control capability is integrated for this application realizing a fault tolerant system. The development of hardware prototype and initial results are presented on this paper.
Design of a Fault-Detection System for FDM-type 3D Printer using Temporal Convolutional Network
Danielle Jaye S. Agron,Gabriel Avelino R. Sampedro,Gabriel Amaizu,Jae-Min Lee,Dong-Seong Kim 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
In the process of additive manufacturing, the devices used to print usually encounter errors and problems that are not easily detected by the device operator. Undetected errors can cause serious damage to the 3D printer and leads to the output being counted as reject, thus leading to both loss in time and resources. The research focuses on the development of a device to monitor the process of 3D printing. The design applies temporal convolutional networks (TCN) to train the device to identify whether certain measurements of the 3D printer will lead to errors in output. The prototype serves as an attachment to the 3D printer and displays measurements and if they are within the safe values.
Danielle Jaye S. Agron,Jae-Min Lee,Dong-Seong Kim 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
A printing technique called fused deposition modelling (FDM) in additive manufacturing make use of Polylactic acid (PLA) material by melting in nozzle that when stacked layer-by-layer it forms a rigid final product. However, due to varying nozzle melting temperature the risk of thermal degradation escalates. In order to avoid that, this paper proposed a scheme to predict the anomaly during the printing process using a shallow recurrent neural network; a shallow recurrent neural network (O-LSTM) framework. A time series thermal estimation is provided to forecast the occurrence of error with a 90.9% accuracy.
Dynamic Simulation and Analysis of the Space Shuttle Main Engine with Artificially Injected Faults
Jihyoung Cha,Chulsu Ha,Jaye Koo,Sangho Ko 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4
Securing the safety and the reliability of liquid-propellant rocket engines (LREs) for space vehicles is indispensable as engines consist of many complex components and operate under extremely high energy-dense conditions. Thus, health monitoring has become a mandatory requirement, especially for the reusable LREs that are currently being developed. In this context, a dynamic simulation program based on MATLAB/Simulink was developed in the current research on the Space Shuttle Main Engine (SSME), a partly reusable engine. Then, a series of fault simulations using this program was conducted: at a steady state operating condition (104% Rated Propulsion Level), various simulated fault conditions were artificially injected into the simulation models for the five major valves, the pumps, and the turbines of the SSME. The consequent effects due to each fault were analyzed based on the time responses of the major parameters of the engine. It is believed that this research topic is an essential pre-step for the development of fault detection and diagnosis algorithms for reusable engines in the future.
김원일,이재명,강종표 한국산업안전학회 1997 한국안전학회지 Vol.12 No.4
From the experimental study of wire-cut Electric Discharge Machining for alloyed steel and tungsten carbide, the characteristics such as hand drum form has been observed and evaluated for various conditions. Hand drum form can be improved when gap voltage and spark cycle become smaller, their thickness become thinner, wire tension become larger and number of cutting is done so many times. When wire-cut 60㎜ thickness tungsten carbide in normal condition, Hand drum form becomes larger due to the low conductivity inducing cobalt composite rising by electrolysis.