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하이브리드 여자방식을 이용한 SRM 의 진동 소음 저감
김창섭,이상훈,안진우 경성대학교 공학기술연구소 2000 공학기술연구지 Vol.7 No.-
The simple motor construction and low cost, fault tolerant power electronic drive has made the switched reluctance drive a strong contender for many applications. But the switched reluctance drive does exhibit higher levels of vibration and acoustic noise than most competing drives. The main source of vibration in the switched reluctance drive is generated by rapid change of radial force when phase current is exthinguished by commutation action. In this paper, a hybrid excitation method is proposed to reduce vibration and acoustic noise of the switched reluctance drive. The hybrid excitation has 2-phase excitation by long dwell angle as well as conventional 1-phase excitation. The vibration and acoustic noise are reduced because the scheme reduces abrupt change of excitation level by distributed and balanced excitation.
김창섭,이상훈,안진우 경성대학교 공학기술연구소 2000 공학기술연구지 Vol.7 No.-
An SRM for a pallet truck drive is developed and tested. The drive system has to operate with low voltage and high current, and has to have the characteristics of DC series motor. The small size, ruggedness high efficiency make it possible to replace with DC motor. Test results show that pallet truck with SRM has better performance characteristics than that of the DC motor's.
酸棗仁이 CT105에 의한 신경세포 상해 및 白鼠의 기억에 미치는 영향
정정욱,박창국,박치상,이소연,윤현덕,신오철 대한본초학회 2005 大韓本草學會誌 Vol.20 No.1
Objective: This study was designed to research whether demonstrate neuroprotective and memory enhancing effects of Z1BU, suggesting its beneficial actions for the treatment of AD. Methods: The present study investigated effects of the dichloromethane extract of Semen Zizyphi Spinosae(ZIBU) on neurotoxicity and reactive oxygen species(ROS) and nitric oxide(NO) formation in PC 12 cell line overexpressed with carboxyl-terminal 105 amino acid peptide fragment of amyloid precursor protein(CT105). In addition, the present study evaluated its radical scavenging activity and effects on acetylcholinesterase(AChE) activity. Furthermore, effects on neuronal loss in CAl area and cognitive deficits induced by scopolamine treatment were also evaluated in rats. Result: we found in this study that ZIBU significantly inhibited apoptotic neuronal death induced by CT105 overexpression in PC12 cells, with the IC_(50) value of 23 ㎍/ml. Based on phase-contrast and fluorescence microscopic examinations, ZIBU reversed morphological changes of CT105-expressed PC-12 cells. It was also found that Z1BU significantly induced neurite outgrowth and inhibited formation of ROS and NO.Z1BU scavenged DPPH radicals and inhibited AChE activity. Furthermore, it attenuated memory impairment induced by the injection of scopolamine in rats, based on passive avoidance test. Crystal violet staining of rat brain slices exhibited increase in the viability of pyramidal neurons in hippocampal CAI area. Conclusion: these results demonstrate neuroprotective and memory enhancing effects of ZIBU, suggesting its beneficial actions for the treatment of AD.
Lee, Sang Bok,Kwon, Myung Ok,Lee, Wan Wo 한국정서행동장애학회 2005 정서ㆍ행동장애연구 Vol.21 No.4
본 연구는 B시에 소재하고 있는 사립유아교육기관의 운영자와 일반교사가 지니고 있는 장애(위험) 유아들의 통합교육에 대한 인식을 알아보고자 하였다. 현재 우리나라 유치원과정의 유아들에 대한 통합교육 필요사항들을 근거로 하여, 이전 연구에서 제시된 질문들을 재구성하여 그 타당도와 신뢰도를 점검한 설문지를 통하여 자료수집 되었다. 222명의 응답자들을 대상으로 수집된 자료분석의 결과, 유아교육기관의 운영자와 일반교사 대부분이 통합교육에 대해 긍정적인 인식을 나타내고 있음을 나타냈다. Inclusion is one of the more attention-getting issues on the current education. The current study was to examine the views of kindergarten principals and general education teachers towards inclusion for young children with disabilities. A sample of 222 participants(99 principals and 113 teachers) in B city of Korea were studied, using a survey questionnaire, their perception was analysed. The results showed positiveness towards inclusion in the respondents' views suggests practical readiness requires to be launched.
( Sang Bok Lee ),( Myung Ok Kwon ),( Wan Wo Lee ) 한국정서.행동장애아교육학회(구.한국정서학습장애아교육학회) 2005 정서ㆍ행동장애연구 Vol.21 No.4
본 연구는 B시에 소재하고 있는 사립유아교육기관의 운영자와 일반교사가 지니고 있는 장애(위험) 유아들의 통합교육에 대한 인식을 알아보고자 하였다. 현재 우리나라 유치원과정의 유아들에 대한 통합교육 필요사항들을 근거로 하여, 이전 연구에서 제시된 질문들을 재구성하여 그 타당도와 신뢰도를 점검한 설문지를 통하여 자료수집 되었다. 222명의 응답자들을 대상으로 수집된 자료분석의 결과, 유아교육기관의 운영자와 일반교사 대부분이 통합교육에 대해 긍정적인 인식을 나타내고 있음을 나타냈다. Inclusion is one of the more attention-getting issues on the current education. The current study was to examine the views of kindergarten principals and general education teachers towards inclusion for young children with disabilities. A sample of 222 participants(99 principals and 113 teachers) in B city of Korea were studied, using a survey questionnaire, their perception was analysed. The results showed positiveness towards inclusion in the respondents` views suggests practical readiness requires to be launched.