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배영민(Youngmin Bae),문영준(Young J. Moon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study numerically investigates the unsteady flow and acoustic characteristics of a flapping wing using a hydrodynamic/acoustic splitting method. The Reynolds number based on the maximum translation velocity of the wing is Re=8800 and Mach number is M=0.0485. The flow around the flapping wing is predicted by solving the two-dimensional incompressible Navier-Stokes equations (INS) and the acoustic field is calculated by the linearized perturbed compressible equations (LPCE), both solved in moving coordinates. Numerical results show that the hovering sound is largely generated by wing translation (transverse and tangential), which have different dipole sources with different mechanisms. As a distinctive feature of the flapping sound, it is also shown that the dominant frequency varies around the wing.
황만호(Man Ho Hwang),배영민(Youngmin Bae),강기동(Kee-Dong Kang),권순정(Soon-Jung Kwon) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
판형교는 자갈도상이 없이 거더에 침목이 직결된 무도상 교량구조로, 현재 일반선에 450개소 이상 부설되어 있다. 최근 일반선 구간의 열차 고속화와 중량화 사업이 활발히 진행되고 있으므로, 판형교 개량 또는 기존 형식에서 레일 장대화 요구는 지속해서 증가하고 있다. 레일 비장대화는 승객의 승차감, 차량의 주행 안정성 저하 및 열차속도의 제한 요인으로 작용하며 이음매구간을 열차가 통과할 때 발생하는 큰 충격하중은 궤도 파괴와 차륜 손상으로 유지보수 비용 증가를 시킨다. 특히 판형교 상의 레일 비장대화는 다른 유도상교량 형식에 비해 큰 소음 및 진동이 발생함에 따라 열차를 이용하는 승객 및 주변 주민의 큰 불편을 초래한다. 따라서 본 논문에서는 기존 판형교 상에서 레일을 장대화할 수 있는 여러 공법을 소개하고 각각의 공법에 대해 비교 분석을 수행하였다. Plate girder bridges are ballastless bridges which do not have the ballast and the sleepers are directly fixed to girders of the bridge. Currently there are over 450 plate girder bridges in the conventional line. Due to the recent trend of improving the conventional line in terms of its speed and weight, there is a growing need of improving as well as performing CWR at the plate girder bridge. If the CWR is not applied to the rail, it will reduce the comfort as well as driving stability and also limit the speed of the train. It will also cause the loading force. This is coming from when the train passes through the joint part. This force will cause the destruction of thee track as well the wheel. Thus, it will increase the need and the cost of maintenance. Not applying CWR at the plate girder bridge is not favorable. This is because when it is compared to the ballast bridge, it has much more noise and vibration. Therefore, passengers as well as individuals live around the track will suffer from them. The following study will introduce construction methods to perform CWR at the existing plate girder bridge and it will conduct comparative analysis on these methods.
입원 중인 조현병 환자를 대상으로 한 심리극(싸이코드라마)이 환자의 의사소통 능력과 대인 관계 기술에 미치는 영향
추교종 ( Kyo Jong Choo ),박명현 ( Myeonghyun Park ),배영민 ( Youngmin Bae ),백수현 ( Soo Hyun Paik ),정수봉 ( Soo-bong Jung ),송명선 ( Myung Seon Song ) 한국정신병리진단분류학회 2021 精神病理學 Vol.25 No.2
Objectives Primary purpose of this study was to evaluate therapeutic effects of psychodrama on inpatients with schizophrenia. Method Psychodrama was administered to 56 patients with schizophrenia who were hospitalized in Keyo Hospital. Similarly, 56 patients who were hospitalized at Keyo Hospital and did not participate in the psychodrama were set as control group. Psychodrama was administered 50 minutes once a week for 3 months. we used Communication Skill Scale, Relationship Change Scale, Relationship Function Scale, Clinical Global Impression-Severity(CGI-S), Brief Psychiatric Rating Scale(BPRS) to assess function of the patients. Assessment was done at the beginning and end of the period. In this study, we compared assessment-score before and after psychodrama first. Then we compared patients who participated in psychodrama and patients who did not. Results After 12 sessions of psychodrama, Patients who participated psychodrama showed improvement in communication skills and interpersonal relationship. Patients also showed improvement in Brief Psychiatric Rating Scale(BPRS) score. there was no significant change in Clinical Global Impression-Severity(CGI-S) score. Conclusion Results suggested that psychodrama is useful treatment method for improving communication and interpersonal skills in hospitalized patients with schizophrenia. we can expect that psychodrama can play a useful role in treatment of schizophrenia patients. Future research to generalize of the results of this study is necessary.