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Repellent Properties of Artemisia Annua against Drosophila Fruit Flies
Hanseul Cho 국제과학영재학회 2016 APEC Youth Scientist Journal Vol.8 No.1
Drosophila, also known fruit flies are amongst the most commonly fruit damaging insects. Chemical treatments will provide only a temporary relief and possess chemicals that harm human health. An annual Korean weed, Artemisia annuaL., has been used as a folk medicine for the treatment of anumber of diseases. In this study, the ethanol extract of A. annua (EEAA) was evaluated for the repellent activities against Drosophila fruits flies. 50 anesthetized flies were placed within a 500ml plastic beaker. The number of fruit flies on the petri dish contained extraction and the behavior of the fruit flies were observed within 5, 10 and 20 minutes time. The results suggest that EEAA possess repellent activities against Drosophila fruit flies.
Determination of Optimum Threshold for Accuracy of People-counting System Based on Motion Detection
Hanseul Ryu,Junho Song,Boram Lee,Kiyoung Lee 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.5
Objectives: A people-counting system measures real-time occupancy through motion detection. Accurate peoplecounting can be used to calculate suitable ventilation demands. This study determined the optimum motion threshold for a people-counting system. Methods: In a closed room with two occupants moving constantly, different thresholds were tested for the accuracy of a people-counting system. The experiments were conducted at 150, 300, 450 and 600 lux. These levels of brightness included the illumination levels of most public indoor areas. The experiments were repeated with three types of clothing coloration. Results: Overall, a threshold of 16 provided the lowest mean error percentage for the people-counting system. Brightness and clothing color did not have a significant impact on the results. Conclusion: A people-counting system could be used with threshold of 16 for most indoor environments.
Hanseul Shim,Gyeongrok Kim,정시온,박기수 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
This study presents a single-line absorption spectroscopy method for the simultaneous measurement of gas pressure and temperature through diode laser absorption spectroscopy using a single absorption line. In the proposed method, the absorbance loss of an absorption line that may occur during baseline subtraction is predicted, and the gas properties are determined by matching a calculated absorbance to a recovered absorbance using the predicted loss. To verify the proposed method, gas property measurements are conducted for air conditions with a pressure range of 10-100 kPa and a temperature range of 300-500 K. An absorption line in the oxygen A band is selected to measure the gas properties of air. Using the proposed method, it is confirmed that the gas pressure and temperature could be measured within errors of 25 % and 18 %, respectively. When the gas pressure is predetermined using a pressure gauge, the gas temperature can be measured within an error of 14 %.