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강병혁(Byung-Hyuk Kang),한철희(Chulhee Han),최승복(Seung-Bok Choi) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.2
In this paper, a semi-active magnetorheological (MR) damper is proposed that can be applied to main landing gear suspension system of the aircraft. For the modeling of MR damper, a damping force in the annular orifice and an air force in the damper strut are derived. A MR damper with two magnetic cores is designed to control the damping force with sufficient dynamic range. After modeling the damper, its structural design with the annular type bypass for fast tension speed is determined considering the characteristics of the landing situation of the aircraft. In addition, through the magnetic field analysis of two magnetic cores, controllable yield force of MR fluid is proposed, designed by the magnetic intensity considering the input current. Next, superior performance of the semi-active damper is demonstrated by calculating the aircraft landing efficiency of passive and semi-active dampers by the damper excitation and aircraft drop simulations. To maximize the landing efficiency of drop simulation, the sky-ground control logic is established. The sky hook and ground hook coefficients can be adjusted by tuning the sky-ground hook weighting factor. After calculating the sky-ground hook force with the best-tuned sky hook and ground hook coefficients, the damping force of the MR damper is controlled by the calculated input current. Consequently, the optimized efficiency plot was obtained in comparison with controlled and passive dampers.
오연풍 ( Youn Poong Oh ),강병혁 ( ·Byung Hyuk Kang ) 한국특수체육학회 2009 한국특수체육학회지 Vol.17 No.4
문화체육관광부 중심의 시도평가가 이루어지지 못하고 있는 상황에서는 대한장애인체 육회를 중심으로 시도의 장애인체육을 평가하는 것이 대안이 될 수 있다. 이러한 관점에서 본 연구에서는 대한장애인체육회 중심의 장애인체육 성과평가 항목을 개발하고자 하였다. 이를 위하여 이론과 실무 분야 전문가 10명을 대상으로 델파이 조사를 실시하였다. 연구결과는 다음과 같다. 첫째 대한장애인체육회의 평가지표에 대하여 개선방안을 제시하도록 한 결과 조직 11개, 현장평가 4개, 사업평가 1개, 고객만족도 평가 1개, 평가전반 2개의 개선사항이 제시되었다. 특별히 시군구 조직과 경기단체 조직, 조직평가 비중확대 등 조직부문에 대한 평가지표의 개선이 많이 제시되었다. 둘째, 결과적으로 시도의 장애인체육 성과를 평가할 수 있는 최종지표로 4개영역 19개지표가 도출되어 제시되었다. 투입영역의 지표는 시도장애인체육예산 대비 국고·기금 확보율과 시도예산 중 장애인체육예산비율이 선정되었다. 과정에서는 중장기 비전 및 계획의 수립과 구체적 실천, 월별 지출목표 달성율(집행율), 민원처리의 신속성·투명성, 자원봉사자 확보·활용실적, 장애인체육지도인력 확보 및 활용, 행정서비스 개선노력, 전문성 신장 노력, 장애인체육회 1인당 서비스 인구, 시군 전달체계 구성이 제시되었다. 산출 지표로 국고/기금 장애인체육예산 집행율, 시도자체 장애인체육예산 집행율이 도출되었다. 결과 지표로 등록선수수, 생활체육에서는 생활체육참여율·동호인조직가입율·어울림체육참여율, 장애인체육활용 가능체육시설면적/전체인구수, 특성화사업의 지표가 도출되었다. 셋째, 모든 지표는 중요도가 1.2(장애인체육회 1인당 서비스 인구)에서 2.6(시도예산 중장애인체육예산비율)사이에 위치해 있는 것으로 나타났다. This study was initiated to propose what must be evaluated of sports service of the local sports association. For this necessity the purpose of this study was to develop performance factor and index of sports service of the local sports association for the disabled. The study was conducted in expert group working at sport for the disabled. 10 expert members who were 5 scholars and 5 administrators participated in the study. Data were collected through the use of Delphi-technique. The results of the study are as follows: First, there are all of same opinion that assesment of KOSAD was room for improvement what there were 11 items in organization factor, 4 in field assess, 1 in program assess and 2 in the whole. Second, 4 performance factors and 19 performance indexes are selected in using Delphi-technique. First stage, ratio of national treasury and sport fund in all the sports for disabled budget and ratio of the sports for disabled budget of Local budget are selected in input factor. Second stage, device and practice long-term plan, ratio of execution of the month budget, rapidity and clearness of deal with civil appeal, collection and use of volunteer, collection and use of sports leader for the disabled, reform effort of service, effort of specialization, ratio of service per man and organization of delivery system in city and town are selected in throughput factor. Third stage, ratio of execution of national treasury and sport fund and ratio of the sports for disabled budget are selected in output factor. Fourth stage, number of athlete, ratio of participation in sports for all, member in voluntary sports organization for the disabled, member of integration sports with the disabled and normal, sports facility for the disabled. Third, the significance of all index were from 1.2(ratio of service per man) and 2.6(ratio of the sports for disabled budget of Local budget).