Search | Korea Science

Park, Bong-Kyu;Han, Cho-Young;Yang, Koon-Ho;Kim, Bang-Yeop;Park, Eung-Sik
- Aerospace Engineering and Technology
- /
- v.4 no.1
- /
- pp.95-102
- /
- 2005
This paper introduces the LAE(Liquid Apogee Engine) and station acquisition fuel budget estimation method for the COMS(Communication, Ocean and Meteorological Satellite) of Korea which is planned to be launched in 2008. And the estimation results are also presented. A statistical approach, more specifically, the Monte-Carlo method was employed to have the estimation include the effect of the launch vehicle GTO injection accuracies. A case study was conducted for several potential launch vehicles to compare the fuel requirements.
PDF

Kang, Pil Shik;Park, Jong In
- Laser Solutions
- /
- v.17 no.3
- /
- pp.10-14
- /
- 2014
By the specific character of femtosecond laser controlled volume of magnitude of micrometer scale could be ablated without melting phase in SKD11 and SUS304. According to the laser machining parameters various sectional shapes could be engraved on the surface of metals. Typical engraved lines were $10{\mu}m$ wide and deep. Coarse-milled surface was made $10{\mu}m$ lower than the original elevation by a bunch of laser-engraved lines in suitable spacing. The repeated banks with a height of $10{\mu}m$ could be made with the combination of the intact area.
PDF

Khan, M.R.;Omoloso, A.D.
- Korean Journal of Pharmacognosy
- /
- v.29 no.3
- /
- pp.155-158
- /
- 1998
In the Asian sub-continent Momordica charantia and Allium sativum are extensively used as food and are popular in herbal medicine. The two were screened against 15 pathogens and both exhibited broard spectrum antimicrobial activity. As compared to the standard antibiotics, M. charantia demonstrated broader and higher level of activity against most of the organisms. On the other hand A. sativum showed comparable activity to the standard antibiotics. Both M. Charantia and A. sativum are proposed as non toxic, safe, broad spectrum antibacterial agents.
PDF

Seo, Young-Soo;Lee, Chun-Sang;Hwang, Lak-Hoon;Kim, Jong-Lae;Byong gon Jang;Kim, Joo-Lae;Cho, Moon-Tack;Park, Ki-Soo
- Proceedings of the IEEK Conference
- /
- 2000.07b
- /
- pp.1013-1016
- /
- 2000
In this study, the estimate speed of rotor in the induction motor with Model Reference Adaptive control System (MARC) principle and to study that vector control system feedbacks speed estimated to speed control system and its result is as follows; Considering with explanation an influence of speed estimation mechanism depend on error about the second resistance size established, it estimates the deviation of the second resistance establishment and exhibits a compensation method, what is more, it designs a reparation program using the fuzzy algorithm and testifies the result with the computer simulation. And besides, it composes the load torque estimation and estimates the load torque, as the result, feedback-compensating the result of estimation, it improves the efficiency. In consequence, it makes a good result for more powerful vector control system about the outside trouble.
PDF

Woo, Sang-Lae;Kim, Hyung-Lae;Park, In-Kap
- Proceedings of the KIEE Conference
- /
- 1987.07a
- /
- pp.256-259
- /
- 1987
In this paper, a servo controller for a robot manipulator is developed. It consists of a conventional MRAS controller for each joint together with a feedback control to Dynamics compensation. To generale the control torque effectively a currant drive method is adopted. The speed of the actuator is measured by using a tachometer and the position of the link is measured by using a potentiometer. To show the effectiveness of the proposed control algorithm the proposed controller is tested in real time.
PDF