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박기준,정헌영 대한토목학회 2022 대한토목학회논문집 Vol.42 No.1
공영자전거는 대표적인 친환경 교통수단으로서 탄소배출을 감소시키고 향후 MaaS 시대에 버스나 도시철도와 같은 대중교통 수단과 연계할 수 있는 First/Last mile mobility로서 중요한 역할을 수행할 수 있을 것으로 여겨지는 교통수단으로서, 국내에서는 2008년 창원시가 최초로 도입하여 운영을 시작했다. 그러나, 10여년 간 이론적 근거 없이 공영자전거의 인프라가 확장되면서 효율성 저하로 운영비가 증가하고 있으며, 이로인해 서비스의 양적확장이 어려운 상황이다. 본 연구에서는 공영자전거의 이용량에 적합한 거치대수 산정 방안을 제시하고, 공영자전거 인프라의 효율성을 평가할 수 있는 효율성 지수를 개발하였다. 본 연구에서 제시한 방법은 공영자전거의 대여량 및 반납량과 거치대수와의 관계 규명을 통해 찾아낸 일반론적인 방법으로서 타 지자체에서도 충분히 활용 가능할 것이라 판단되며, 향후 공영자전거의 효율성 향상과 공영자전거의 인프라 확대로 이어질 수 있기를 기대한다.
박기준 대한스포츠물리치료학회 2014 정형스포츠물리치료학회지 Vol.10 No.1
This study is being trained for five years. Korea national team Fencing Players Retrospective surveillance study. Fencing players to the diagnosis of sports injuries that occur each event that occurs frequently in areas with a lot of damage to sport, To evaluate the frequency and characteristics etc. The incidence and the average risk of sports injuries due to competitions and training of athletes during training and research to Compare each event, and To evaluate the characteristics of sports injuries are also common in each event recurrence. Occurrence is related to the appeal and sporting activities in the players who participated in the competition and internal / external training during the training period. Musculoskeletal symptoms and signs of all acute / chronic that requires the attention of medical personnel was defined as sports injuries. injury location, and injury Grade (Grade I = 1-3 treatment days, Grade II = 4-7 treatment days, and Grade III = > 8 treatment days) were extracted and assessed. Injury location was then set to the regions used by the IOC during the London Summer Olympic Games, and then subdivided into the Head and Neck, Upper extremity, Trunk, and Lower extremity. Sports injuries were classified for a frequency analysis of the collected data by using the SPSS v12. The chi-squared test was used to test for significance when making multiple comparisons. Statistical significance was set to p< 0.05. There were a total of 849 injuries recorded during January 2010 till December 2014. Almost half of these injuries 478(56.3%) were Grade I injuries. Followed by the Grade II 202(23.8%), and Grade III 169 (19.9%). Fencing players the injury rate was 2.97 injuries / 1000 hours of training per athlete at the center. Injuries are Lower extremity (45.3%) > Trunk (24.4%) > Upper extremity (23.9%) > and Head and Neck (6.4%) in order. The most common sites of injuries are Lumbar Spine/Lower Back, Ankle, Thigh, and Knee. This study was performed to investigate the dynamics of a relatively unpopular sport of Fencing, non-professional sports event. These findings are considered to be able to be helpful in providing useful information to make a specific detection software in various fields for future sports injury.
박기준,백수현,김용,윤신용,김일남 동국대학교 산업기술연구원 1999 산업기술논문집 Vol.14 No.-
본 논문에서는 링형 초음파 모터의 고정자의 굽힘진동에 대한 일반적인 해석에 대해 기술하였다. 전기-기계 결합효과를 고려하여 일반화 응력과 변형의 개념을 정립하였고, 일반화 압전방정식, 일반화 응력과 변형의 관계, 미분운동방정식에 대해 기술하였다. 또한 고정자의 진동모드 계산과 공진주파수를 계산하기 위해 유한요소법을 적용하였으며, 유한요소법을 이용한 진동해석 프로그램인 ATILA를 사용하여 고정자의 공진주파수와 변위를 계산하였다. 초음파 모터의 구동을 위해 20kHz 이상의 고주파 전원이 필요하기 때문에 2상 병렬 공진형 인버터를 제작하여 구동전압의 주파수 및 크기를 측정하여 고정자 해석과 구동회로 시뮬레이션과 비교하였다. In this paper, the bending vibration analysis of the stator for a ring type ultrasonic motor is described. Considering the electromechanical coupling effect, the concepts of generalized stress and strain are explained in detail using the generalized piezoelectric equations, which is the relationship between generalized stress and strain, the differential motion equation were derived. The vibration modes and resonance frequencies of the stator were calculated using the finite element code ATILA. For driving of ultrasonic motor, a two-phase parallel-resonant inverter was made. The stator analysis results and driving circuit simulation results are compared with measured frequencies and amplitudes.