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버즘나무방패벌레 (Corythucha ciliata Say)의 생태적 특성 및 살충제감수성
송철,조광연,Song, Cheol,Cho, Kwang-Yun 한국생명과학회 2000 생명과학회지 Vol.10 No.2
To understand the biological characteristics of Corythucha ciliata occurring in Korea, developmental periods and its susceptibility to several insecticides were examined under growth chamber condition at $25^{\circ}C$. It took 11.1 day from egg to hatch. And duration of each stage up to the 5th nymph after hatching was 4.0, 2.1, 2.0, 2.9, and 4.0 days, respectively. Total duration from egg to adult was 26.1 days, preoviposition period was 12.2 days, and average number of eggs laid by a female was 83.0. Sex ratio of female was 51.6% and lifespan of female adult was 43.2% days. LC50 value of deltamethrin and esfenvalerate were 0.8 and 0.9 ppm, respectively. Insecticidal effects were better in pyrethroids than organophosphates and carbamates.
宋鐵,朴世承 조선대학교 동력자원연구소 1980 動力資源硏究所誌 Vol.2 No.1
This paper is study of error correction and factors of inductosyn, resolver and photoelectric detectors. Present-day inner-type servomotors, photoelectric detectors and resolvers can only correct the motor shaft and the precision depends upon the photo-electric detector and resolver. Thus when an error of final power translation in the machine, such as gear backlash, ballscrew twist, and elongation of heat and tension occur, there arise defects which the detector can not detect. Though it is possible to make a correction, it is very difficult to procuce automization. In the case of using inductosyn in a closed loop system, good accuracy is possible. High precision can be obtained, but if we canprevent abonrmalities which occur from time to time by using an inductosyn, we can reduce the error and approach DNC system-atization by means of using linear inductosyn effectively. It demands the study of servo systems with the matter of detector selection.