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Implementation of Smartphone Server System for Remote Monitoring•Control
이권윤,이상부 한국정보기술학회 2013 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.3 No.2
These days, the user response to the smartphone is very positive because of its serviceability and various utilization of applications. The need of smartphone-based server which can monitor and control surrounding information at anytime, anywhere is being emphasized. In this paper, a server system which can effectively monitor and control surrounding information on personal smartphone will be designed and realized with Arduino platform. The suggested system can monitor and control the information of sensor value at anytime, anywhere in realtime with wireless connection to existing high-speed internet. So the inconvenient and established PC-based problems are resolved. For that, in this paper, we realized general WiFi module-connected server system which can monitor and control surrounding information. From the experiment results, we confirmed the user’s smartphone accurately received and controlled the data that server system transmitted.
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이권윤(Gwon-Yoon Lee),이상부(Sang-Boo Lee) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.12
Researches have been conducted continuously in order to communicate both short and long distance information with an integrated communication system by using diverse systems such as wire and wireless communication. In various industry fields, it is required to communicate and control by using communication protocols. In this paper, we developed an integrated communication system which can communicate RS232 communication which is appropriate for a short distance serial communication, RS485 which is commonly used for long distance serial communication, TCP/IP for the Internet communication, Zigbee radio communication mainly used for sensor networking system, and Bluetooth which is related to a short distance radio communication with using one system. For a trustworthy integrated communication system, we developed an application program which is able to interface five kinds of communication protocols. According to the experimental results, the integrated communication system accurately sent, received and transferred data through the five communication protocols in real time and showed superb performance.
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이권윤(Gwon-Yoon Lee),이상부(Sang-Boo Lee) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.10
Various algorithms and models of deep learning were developed, and RNN shows good performance in future prediction system. RNN and LSTM applied universal prediction system was realized in this paper, and performance was evaluated by cost value. Difference between input data was so big that we normalized this input data, and sequence size of learning input was 5 in the performance experiment. The legibility of the results was increased by displaying learning result, predictive execution result and cost values on a real-time graph. In this experiment, accomplishment of learning was confirmed by cost values decrease from learning number 150 to 0.085. future prediction system precisely learned learnin target value and test target value in a small number of learning time in a short time. Furthermore, cost value decreased to wanted value, confirming that the performance of suggested prediction system is excellent.
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상태방정식을 이용한 디클로로메탄/이산화탄소 혼합 용매의 열역학적 거동 연구
권웅,이권윤,정의경,Kwon, Woong,Lee, Kwonyun,Jeong, Euigyung 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.5
Single- or multi-component supercritical fluids, which exhibit excellent solubility in polymers, are used as solvents in polymer-based industries. Because their properties change easily with volume, temperature, and pressure, the use of single- or multi-component supercritical fluids in industrial applications requires the supercritical fluid apparatus to be designed according to the required volume, temperature, and pressure. Supercritical fluid apparatus design and optimization can benefit greatly from the analysis and understanding of the thermodynamic behavior of single- or multi-component fluids. Therefore, this study investigated the correlation between the composition ratio of a dichloromethane/carbon dioxide mixture and pressure at 200 ℃ using ideal gas, van der Waals, Redlich-Kwong, Soave-Redlich-Kwong, and Peng-Robinson equations of state. The critical temperature according to the compositional change of the dichloromethane/carbon dioxide mixture was predicted by the basic mixing rule. This analysis of the thermodynamic behavior of the dichloromethane/carbon dioxide mixture can be used for optimizing supercritical fluid apparatuses.
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