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Exponentially Stable Lyapunov-Function-Based Controller for a Flyback CCM Converter
Wi, Seok-Min,Lee, Jin S.,Kim, Minsung Institute of Electrical and Electronics Engineers 2018 IEEE transactions on industrial electronics Vol. No.
<P>In this paper, we propose a Lyapunov-function-based controller for the flyback converter operating in the continuous conduction mode (CCM). The controller consists of a duty-ratio feedforward control unit and a Lyapunov-function-based feedback control unit. The duty-ratio feedforward signal is used to reduce the burden from the Lyapunov feedback controller. The control system guarantees global exponential stability of the closed-loop system and, hence, offers fast transient response under large-signal perturbations. In constructing the controller, we use the average model of the flyback CCM converter taking the parasitic components into account. Numerical simulations confirmed its superior performance, and experimental tests validated the proposed control approach.</P>
REDUCTION OF AUDIBLE SWITCHING NOISE IN INDUCTION MOTOR DRIVES USING RANDOM POSITION PWM
Seok-Hwan Na,Seok-Oh Wi,Young-Cheol Lim,Sung-Hak Yang 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
RPWM (Random Pulse Width Modulation) is a switching technique to spread the voltage and current harmonics on the wide frequency area Using randomly changed switching frequency of the inverter, the power spectrum of the electromagnetic acoustic noise can be spread to the wide-band area The wide-band noise is much more comfortable and less annoying than the narrow-band one. So RPWM have been attracting an interest as an excellent method for the reduction of acoustic noise on the inverter drive system In this paper a new RPPWM (Random Position PWM) is proposed and implemented Each of three pulses is located randomly in each switching interval Along with the randomization of PWM pulses, the space vector modulation is executed in the C167 microcontroller also The experimental results show that the voltage and current harmonics were spread to wide band area and that the audible switching noise was reduced by proposed RPPWM method.<br/>
김위식 ( Wi Sik Kim ),장민석 ( Min Seok Jang ),정성주 ( Sung Ju Jung ),김석렬 ( Seok Ryel Kim ),박명애 ( Myoung Ae Park ),이정호 ( Jeong Ho Lee ),명정인 ( Jeong In Myeong ),오명주 ( Myung Joo Oh ) 한국어병학회 2011 한국어병학회지 Vol.24 No.1
The specific antibody response of olive flounder, Paralichthys olivaceus to different water temperature were tested by enzyme-linked immunosorbent assay (ELISA). In the rearing temperature of 15℃, first anti-bovine serum albumin (BSA) antibody titer was appeared after 14 days of immunization, whereas 24∼48 days post-immunization (PI) resulted maximum antibody titer in all 5 experimental fish with optical density (OD) values 1.94∼3.04. At the end of the experiment (84 days), 0.03∼1.28 OD values were observed. In the rearing temperature of 12∼13℃, first antibody titer was found 28 days PI in 2 out of 5 fish. Three fish shown high OD titer (1.88∼2.68) between 56 and 70 days and OD values of 0.49 to 2.35 were observed at 84 days. However, the anti-BSA antibodies of two fish showed less than 0.8 OD values until 84 days. In the rearing temperature of 10℃, specific antibody appeared at 56 days, maximum antibody titer was observed at 70 days in 2 out of 5 fish (OD values: 1.37∼1.53) and 1.00 to 1.11 OD values were observed at 84 days. Rest 3 fish showed OD values of 0.12 to 0.68 much below to that of other 2 fish, throughout the experimental period. In conclusion, specific antibody response of olive flounder at high temperature was much faster, higher and longer than that at lower temperature.
항원의 투여방법 및 사육환경 변화에 따른 넙치의 특이항체 반응
김위식 ( Wi Sik Kim ),한종석 ( Jong Seok Han ),장민석 ( Min Seok Jang ),서한길 ( Han Gil Seo ),정성주 ( Sung Ju Jung ),박정준 ( Jung Jun Park ),김석렬 ( Seok Ryel Kim ),오명주 ( Myung Joo Oh ) 한국어병학회 2011 한국어병학회지 Vol.24 No.2
본 연구에서는 백신을 넙치 양식 현장에 적용하기 위한 기초연구로서 항원의 투여방법 및 항원 투여 후 사육환경 변화에 따른 넙치의 특이 항체 반응에 대한 영향을 조사하였다. 항원의 투여방법에 따른 항체 반응을 조사하기 위해 넙치에 BSA를 복강 및 근육 주사한 후 주기적으로 혈액을 취해 BSA에 대한 항체가를 측정한 결과, 근육 주사법이 복강 주사법보다 항체형성 초기시점에서 약간 높은 항체가를 나타났으나 그 이후의 항체 반응에는 유의적인 차이가 관찰되지 않아, 백신을 투여하는 방법으로 근육 주사법뿐만 아니라 복강 주사법도 유용하게 사용될 수 있을 것으로 사료되었다. 사육환경 변화에 따른 백신의 영향을 조사하기 위해 BSA를 면역시킨 넙치에 사육수온의 급하강, handling 및 중유에 노출시킨 후 항체가를 측정한 결과, 수온변화 및 handling 실험구가 양성 대조구보다 항체형성 초기시점에서 약간 높은 항체가를 나타났으나, 그 이후의 항체 반응에는 서로간의 유의적인 차이는 관찰되지 않아, 위의 환경변화는 넙치의 특이 항체반응에 영향을 거의 끼치지 않는 것으로 확인되었다. 이상의 결과, 넙치 양식현장에서 백신은 일시적인 수온변화, 중유노출 및 handling에 의한 환경변화에서도 유용하게 사용 될 수 있을 것으로 사료되었다. The specific antibody response of olive flounder, Paralichthys olivaceus to change in rearing-environmental conditions post immunization with antigen (bovine serum albumin, BSA) and different routes of antigen administration were investigated by enzyme-linked immunosorbent assay (ELISA). To test the effect of routes of antigen administration, flounder were injected intraperioneally or intramuscularlly with 1 mg of BSA. In addition, to test the effect of change in environmental condition post immunization, flounder were injected intraperioneally with 1 mg of antigen, and then were exposed to acute thermal change (the water temperature (WT) was decreased from 21℃ to 15℃ within 30 min and maintained at 15℃ for 3 h), handling (fish were caught and subsequently held out of water for 1 min) or heavy oil (76 g/ 200 L for 2 days). Consequently, there was no significant difference between intraperioneal (IP) and intramuscular (IM) injections except at 10 days post-immunization. With these results, it suggests that both IM and IP injections may be used as route of vaccination. Futhermore, no significant difference was observed in the antibody response among the groups exposed to heavy oil, handling, sudden drop of WT and positive control except at 10 days post-immunization. From these results, it was confirmed that specific antibody response was not affected by the above mentioned rearing-environmental conditions, suggesting that vaccination can be employed at changing rearing-environmental conditions.
위태석 ( Wi Tae-seok ) 한국식품유통학회 2017 食品流通硏究 Vol.34 No.2
In this paper, the changes in the distribution environment surrounding the wholesale market and the response of the wholesale market to them are analyzed, dividing into the central wholesale market and the local wholesale market. In this way, the difference between the operation of the markets is derived, and the directions for enhancing the roles of the local wholesale market and the policy improvement measures are suggested. Also, considering the policy implications between the markets, we review the reclassification methods of the markets and seek to revitalize measures and systems through the operation of differentiated local wholesale markets.