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김재선 ( Kim¸ Jaeseon ) 한국스페인어문학회 2021 스페인어문학 Vol.- No.100
Hamelin is a small city in Germany which is known for the background of ‘the Pied Piper of Hamelin.’ In the story, a piper comes to town, playing his pipe and driving out the troublesome rats in return for payment. However, after successfully clearing out the rats, the townfolk broke their promise to pay him. As a result, he lured entire city’s children away by playing his pipe again. The story of the Pied Piper of Hamelin became a widely loved fairy tale by the Brothers Grimm and Robert Browning as they re-wrote it in 1812 and 1842 respectively. Juan Mayorga, one of the representative Spanish modern playwrights, was also interested in this story and wrote his play, Hamelin (2005). Through this tragic story, Mayorga highlights greed and the irresponsible attitude of the adults who broke their promises. In addition, he called attention to the problem of child sexual abuse in our society by using his theatrical imagination. In order to lead the audience’s focus to the story’s topic, the writer used Brecht’s epic theatrical technique, giving the audience distance from the story. While examining diversity in contents and types in modern Spanish plays, this study aims to expand the research territory of it.
THERMAL FRICTION TORQUE CHARACTERISTICS OF STAINLESS BALL BEARINGS
JaeSeon Lee,JiHo Kim,JongIn Kim 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
Stainless steel ball bearings are used in the control element drive mechanism and driving mechanisms such as step motor and gear boxes for the integral nuclear reactor, SMART. The bearings operate in pressurized pure water (primary coolant) at high temperature and should be lubricated with only this water because it is impossible to supply greases or any additional lubricant since the whole nuclear rector system should be perfectly sealed and the coolant cannot contain ingredients for bearing lubrication. Temperature of water changes from room temperature to about 120 degree Celsius and pressure rises up to 15㎫ in the nuclear reactor. It can be anticipated that the frictional characteristics of the ball bearings changes according to the operating conditions, however little data are available in the literature. It is found that friction coefficient of 440C stainless steel itself does not change sharply according to temperature variation from the former research, and the friction coefficient is about 0.45 at low speed range. In this research frictional characteristics of the assembled ball bearings are investigated. A special tribometer is used to simulate the axial loading and the bearing operating conditions, temperature and pressure in the driving mechanism in the nuclear reactor. Highly purified water is used as lubricant, and the water is heated up to 120 degree Celsius and pressurized to 15㎫. Friction force is monitored by the torque transducer.
Synergistic effects of oxygen on phosphine for the control of 6 major agricultural pests
Jaeseon Lee,Hyun Kyung Kim,Hyunna Koo,Gil-Hah Kim,Byung Ho Lee 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
Phosphine(PH3) is very effective fumigant and is widely used to control pests. Oxygen treatment was found to enhance phosphine toxicity and reduce fumigation time. We researched the insecticidal activities and synergistic effects of oxygen with phosphine(PH3) against on adult stage of 6 agricultural pests as Frankliniella occidentalis, F. intonsa, Pseudococcus comstocki, Planococcus citri, Myzus persicae and Tetranychus urticae. Adults F. occidentalis, F. intonsa, P. comstocki and P. citri was highly susceptible to PH3 at 2mg/L for 2h treatment. However, M. persicae and T. urticae were showed very low fumigation effects at 2mg/L for 2h treatment. These 2 pests were treated with PH3 to increase the times (16h and 20h). And we also researched the synergistic effects of PH3 under controlled atmospheres of 50% and 80% oxygen(O2). Increase of the time and atmospheric oxygen showed improving activities of the PH3 in the 2 agricultural pests. Therefore, PH3 is an effective fumigant against F. occidentalis, F. intonsa, P. comstocki and P. citri, and its synergistic effect with oxygen is effective to control M. persicae and T. urticae. PH3 with oxygen could be useful for managing the agricultural and quarantine pests.