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나성주(Sung Ju Na),최상호(Sang Ho Choi),이선호(Sun Ho Lee),안종성(Jong Sung Ahn),김정수(Jung Soo Kim) 한국조리학회 2013 한국조리학회지 Vol.19 No.3
This study investigates the quality characteristics of Sikhye, a Korean traditional drink, made with different amounts of Monascus anka rice, or red yeast rice, and the results are as follows. During the saccharification process of red yeast rice, there was not significant change in pH, and its sugar content increased. It revealed that the optimal hours of saccharification for making Sikhye were four or five hours, which showed the highest in ° Brix. PH decreased significantly with increasing amounts of red yeast rice, and there was no change in sugar content and reducing sugar. Chromaticity L values decreased with increasing amounts of red yeast rice, and a value, b value and the turbidity increased. DPPH free radical scavenging activity of the samples showed significant differences in the samples with high scores as the amounts of red yeast rice increased. As a result of measuring the total microorganism number of the sample stored at 4℃, storability was improved with increasing amounts of red yeast rice. Preference was high in the order of 40%, 50%, 30%, 20%, 0%, and 10%, and the optimal amount of red yeast rice was less than 40-50%. Adding red yeast rice showed high scores in the sensory test, showing red color in Sikhye. In addition, its antioxidative activity effect and microbial growth inhibitory activity were considered to improve storability and preference.
나성주(Sung-Ju Na),송주환(Ju-Whan Song) 한국디지털콘텐츠학회 2021 한국디지털콘텐츠학회논문지 Vol.22 No.4
This study proposes a monitoring system that can remotely check and transmit environmental conditions of plants in real time by measuring temperature, humidity, carbon dioxide, etc. which are factors affected by plants using a Raspberry Pi. Introducing an implementation example that enables you to check the environmental status of plants on a smartphone in real time through MQTT. It utilizes the Raspberry Pi, which is more open than the existing closed Arduino system and makes remote access even easier. The environment in which plants are placed is measured through various sensors connected to the Raspberry Pi. It is a system that collects environmental data, stores it in a web database, and checks it with a smartphone through MQTT in real time. This study is expected to reduce the cost of constructing an expensive Smart Farm and relieve the burden of farmers.
펠티어 모듈과 PID 제어를 이용한 온도 정밀제어 시스템 개발
나성주(Sung-Ju Na),송주환(Ju-Whan Song) 한국디지털콘텐츠학회 2022 한국디지털콘텐츠학회논문지 Vol.23 No.3
This study designed and developed a temperature precision control system for a small chamber that can be used for plant research using Raspberry Pi and Peltier module. The existing system that goes into a small chamber was a simple on/off control. This greatly affected the temperature, which is a factor closely related to plant growth. The temperature was not maintained, and the vibrating phenomenon around the target temperature was found. In order to solve this point, this study calculated each temperature and the control amount every 1 minute through PID control to control the Peltier module. As a result, when the external temperature vibrates in a decimal point unit at 22 degrees Celsius, the chamber implemented in this study was confirmed that the internal temperature of 20.2 degrees was maintained for about 20 minutes. Through this study, it will be of great help to researchers by realizing factor precision control even in a small chamber.