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금속 및 샌드위치 복합재 유도탄 구조체의 흡음 및 차음 특성에 관한 실험적 연구
이윤규,이대은,진병대,이동민,Lee, Yoon-kyu,Lee, Dae-oen,Jin, Byung-Dae,Lee, Dong-min 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.3
Recently, as the speed and performance of the launcher and the missile have been improved, it is necessary to consider the acoustic load of launching and flight in initial design step. In this paper, an experimental study on acoustic absorption and transmission characteristics of aluminium vs. sandwich composite structures were conducted. The overall noise reduction was evaluated by performing an acoustic test in the reverberation room, and the acoustic absorption and transmission loss of the structures were analyzed by conducting the sound absorption test inside the structure.
적외선 체열 촬영을 이용한 중풍칠처혈 자침시 체표온도 변화에 관한 Pilot Study
이윤규,이윤경,서보명,윤종석,김경운,최성훈,이경민,임성철,정태영,한상원,서정철,Lee, Yun-Kyu,Lee, Yoon-Kyoung,Seo, Bo-Myung,Yun, Jong-Seok,Kim, Kyung-Un,Choi, Sung-Hun,Lee, Kyung-Min,Lim, Seong-Chul,Jung, Tae-Young,Han, Sang-Won,Seo, Ju 대한약침학회 2005 Journal of pharmacopuncture Vol.8 No.3
Objectives : This study was designed to find out the effect of seven acupoints of stroke in cerebrovascular hemiplegia patients. Methods : This study was performed on 6 patients with cerebrovascular hemiplegia (test group) and 6 health persons(control group). We measured temperature of skin surface of test and control group using digital infrared thermographic imaging(D.I.T.I) after acupunture on seven acupoints of stroke. And we calculated difference of skin temperature between healthful and affected side for each groups. Results : There was significant difference in area 3 in both two groups between before and after acupuncture. But in general there Was no significant difference between two groups on thermographic change. Conclusions : This is pilot study, so further studies are required to find out the effect of seven acupoints of stroke in cerebrovascular hemiplegia patients.
이윤규,정재웅,조원호,Lee, Yoonkyoo,Jung, Jae Woong,Jo, Won Ho The Korean Fiber Society 2013 한국섬유공학회지 Vol.50 No.1
Two kinds of low-bandgap alternating copolymers composed of thiophene and benzothiadiazole were synthesized via the Stille coupling reaction. The effect of number of alkyl groups attached to oligothiophenes in the repeating unit of the copolymers on their optical, electrochemical, and photovoltaic properties was systematically investigated. One of the new polymers, poly(3,3"-dihexyl-2,2':5',2"-terthiophene-alt-2,1,3-benzothiadiazole) (P1), has better intermolecular packing than the other poly(3,3',3"-trihexyl-2,2':5',2"-terthiophene-alt-2,1,3-benzothiadiazole) (P2), and thus P1 is more beneficial for achieving high charge carrier mobility. P1-based device shows the power conversion efficiency as high as 2.19% when blended with [6,6]-phenyl-$C_{71}$-butyric acid methyl ester after thermal treatment at $170^{\circ}C$ for 30 min.
일부 방사선과 재학생의 방사선사 이미지 결정에 대한 조사
이윤규,서충원,신용섭,최승환,탁은미,김보미나,김선칠,Lee, Yun Gyu,Seo, Choung Won,Shin, Yong Seob,Choi, Seung Hwan,Tak, Eun Mi,Kim, Bo Mi Na,Kim, Seon Chil 대한디지털의료영상학회 2012 대한디지털의료영상학회논문지 Vol.14 No.2
The objectives of this study were to determine radiologic technologist image of some of the majored in department of radiology and collected data of 196 students were analyzed. The results obtained from this study are as follows 1. Department of radiology selective aspect appears the many have a positive opinion but now department satisfaction dropped 2. Department of radiology educational aspect appears the important things of clinical training programs and the national exam special lectures are high 3. Radiologic technologist's futural aspect appears high the many hope to get the university hospital for job plan after graduation and have a positive opinion 4. Radiologic technologist's professional aspect appears high the many think high skilled workers as the essential prerequisites of the radiologic technologist.
외란관측기와 슬라이딩 모드 제어기를 이용한 영구자석 동기전동기의 강인제어
이윤규,안호균,윤태성,곽군평,박승규,Lee, Youn-kyu,Ahn, Ho-gyun,Yoon, Tae-sung,Kwak, Gun-pyong,Park, Seung-kyu 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.7
Many robust controllers have been studied but most are considered in the theoretical point of view and can be used for only specific systems. So, in this paper, a more practical robust controller is proposed based on SMC(sliding mode control) and disturbance observer. The integral sliding mode is used to eliminate the reaching phase and minimizes the steady-state error, and the disturbance observer reduces the chattering due to the switching input for the bounded disturbances. The inevitable chattering of SMC is also removed by replacing the sign function with dead-zone function. The proposed controller has the improved steady-state error and robustness compared to PID controller. 불확실성에 강인한 제어기에 대한 연구는 활발하지만 대부분의 연구들은 제어 이론의 효용성을 검증하기 위한 실험 수준에 머무르거나 특정한 전용시스템에만 구현되고 있어 범용성을 가지는 상용화된 제품에는 적용되지 못하고 있다. 따라서 본 논문에서는 슬라이딩모드제어기와 외란관측기를 이용한 보다 실용적인 강인한 제어기를 제안하였다. 도달시간을 제거하고 정상상태오차를 최소화하기 위해 적분슬라이딩모드를 이용하였고, 외란관측기를 적용하여 스위칭 입력의 채터링을 감소시켰다. 또한 아직까지 남아있는 채터링은 데드존 함수를 이용함으로써 완전히 제거하였다. 제안된 제어기는 PID제어기에 비해 개선된 정상상태 오차와 강인성을 보인다.