체간안정화 훈련이 만성 뇌졸중 환자의 호흡기능에 미치는 효과

이경진(Kyeong-Jin Lee),정주현(Ju-Hyeoun Jeong),조명래(Myeong-Rae Jo),김세윤(Se-Yoon Kim),김난수(Nan-Soo Kim) 대한심장호흡물리치료학회 2019 대한심장호흡물리치료학회지 Vol.7 No.1

Purpose : The purpose of this study is to examine the effects of trunk stability training on improving trunk control, respiratory function, and respiratory muscle activation in stroke patients. Methods : The subjects were assigned to two groups: the intervention group (n=15) and the control group (n=15). Both groups participated in a conventional stroke rehabilitation program, but the intervention group also received trunk stability training for 30 minutes a day, 3 times a week, for 6 weeks. The main trunk stability exercise consisted of the dead bug exercise. Trunk control was assessed using a trunk impairment scale, and respiratory function (pulmonary function and respiratory muscle function) was assessed using spirometry. The data were analyzed using the Pearson correlation, independent t-test, and paired t-test. Results : Trunk control was significantly positively correlated with pulmonary function and respiratory muscle strength. Both groups showed a significant increase in trunk control and respiratory function. Conclusion : This study demonstrated that a conventional stroke rehabilitation program and trunk stability training have positive effects on respiratory function and respiratory muscle activation in stroke patients.

광섬유 격자 소자를 이용한 WDM 시스템용 전광 분기 결합 장치의 구조 연구

김세윤,이상배,최상삼,정준,김상용,박일종,정지채,Kim, Se-Yoon,Lee, Sang-Bae,Choi, Sang-Sam,Chung, Joon,Kim, Sang-Yong,Park, Il-Jong,Jeong, Ji-Chai 대한전자공학회 1997 電子工學會論文誌, D Vol.d34 No.4

We demonstrate a novel wavelength -division add/drop multiplexer employing fiber bragg gratings and polarization beam splitters. the multiplexer is easy to fbricate without any special technique such as UV trimming, and yet shows very stable performance with less than 0.3-dB crosstalk power penalty in a 0.8-nm-spaced, 2.5Gbps-per-channel WDM transmission system. We find that the rejection of adjacent channels is more than -6dB, and the signal leakage through output port is less than -34dB.

이미지 센서기반의 태양광 자동 추적 시스템 개발

김세윤,안서길,김성호,Kim, Se Yoon,An, Seo Kil,Kim, Sung Ho 한국스마트미디어학회 2014 스마트미디어저널 Vol.3 No.1

전 세계적으로 석유자원의 고갈로 인해 석유가격의 상승 및 중국, 인도 등 거대개도국의 에너지 수요 폭발로 국내외 에너지환경은 새로운 도전과 변화의 국면에 처해 있다. 그러나 태양광 발전은 기존 발전방식에 비하여 발전 단가가 높고 에너지 밀도가 희박하여 일정한 전력을 이용하기 위해서는 넓은 면적의 태양전지모율 설치 장소가 필요하다. 또한 기상조건 및 자연조건에 절대적인 영향을 받기 때문에 태양광 발전의 효율적인 발전을 위해서는 지리적인 위치와 태양의 위치 등을 고려하여 태양전지모듈이 지속적으로 많은 양의 발전을 할 수 있게 하는 기술이 필요하다. 이에 본 연구에서는 기존 추적 시스템의 문제점을 해결하기 위해 새로운 형태의 태양 추적 시스템을 제안하고자 한다. 또한 제안된 기법의 유용성을 확인하기 위해 제작된 시제품에 알고리즘을 구현하여 실제 실험을 수행하고자 한다. Recently, domestic energy environment is facing new challenges owing to the depletion of fossil fuel such as oil. Renewable energy resources including solar and wind energy are attracting more interests than ever before. However, solar power system is costly in comparison with the conventional power generation systems and also the energy density is low. Furthermore, large area is required in order to install solar power system. Generally, performance of solar power system is affected by weather conditions and alignment of sun and the solar cell modules. In this study, a new type of sun tracking system for solar power system is proposed. To verify the feasibility of the proposed system, actual implementation of prototype system and experiments are carried out.

Mulligan의 Sustained Natural Apophyseal Glides Mobilization이 만성 요통 환자의 요부근 활성도에 미치는 효과

김세윤,김난수,Kim, Se-Yoon,Kim, Nan-Soo 대한물리치료학회 2013 대한물리치료학회지 Vol.25 No.1

Purpose: Low back pain occurs and frequently recurs in many people. An imbalance of paraspinal muscle activity can cause low back pain. Mulligan's concept of mobilizations with sustained natural apophyseal glides (SNAG) is a common method for treating low back pain. The purpose of this study was to investigate the effects of this method on paraspinal muscle activity in patients with chronic low back pain. Methods: Twenty-one patients with low back pain participated in this study. Patients were classified using the Oswestry disability index. The subjects' paraspinal muscles were measured by surface electromyography both before and after the SNAG mobilization. We measured the root mean square value of the paraspinal muscles during lumbar flexion and extension. Results: Paraspinal muscle activity in patients with chronic low back pain was different between the right and left sides. Importantly, paraspinal muscle activity significantly decreased after using the SNAG mobilization method. Conclusion: This study shows a difference between paraspinal muscle activity in chronic low back pain patients and finds that the Mulligan's concept of SNAG mobilization is effective at reducing imbalances in paraspinal muscle activity in low back pain patients.

압전 소자형 광섬유 격자 소자를 이용한 파장 분할 다중화 시스템용 파장 가변형 광 분기/결합 장치

김세윤,이상배,최상삼,정준,정지채,Kim, Se-Yoon,lee, Sang-Bae,Choi, Sang-Sam,Chung, Joon,Jeong, Ji-Chai 한국광학회 1997 한국광학회지 Vol.8 No.4

기존의 광섬유 격자 소자를 이용한 광 분기/결합 장치들이 광섬유 격자 소자의 브래그 파장에 해당하는 신호만을 선택할 수 있었던 단점을 극복하기 위해 압전 소자에 광섬유 격자 소자를 부착한 압전 소자형 광섬유 격자 소자를 제작하고, 이러한 압전소자형 광섬유 격자 소자와 편광 선속분할기를 이용하여 파장 분할 다중화 시스템용 파장 가변형 광 분기/결합 장치를 제안하고 실험하였다. 본 장치는 두 빛의 편광 상태를 이용하여 광섬유 격자 소자에 해당하는 파장의 신호를 분기/결합하는 장치로서 외부의 온도 변화에 크게 영향을 받지 않는 안정적인 특성을 보였다. 압전 소자에 전압을 인가함으로써 광섬유 격자 소자의 브래그 파장에 해당되는 신호(1549.3 nm)뿐만 아니라 가변된 파장(1550.1 nm)의 신호도 분기/결합할 수 있었다. 파장을 가변하지 않을 경우와 파장을 가변했을 경우 모두 광섬유 격자 소자에 의해 분기된 신호와 인접 채널 신호간의 차이 -26 dB 이하였으며 분기된 신호 중 광섬유 격자 소자를 통해 나오는 누설 신호는 -34 dB였다. We proposed and demonstrated a tunable wavelength optical add/drop multiplexer(OADM) employing piezoactuated fiber grating pairs and polarization beam splitters. We used piezostack act as a fiber stretcher, using the fact that the resonant wavelength of the grating can be controlled by the axial strain along the fiber grating. The polarization controlled configuration showed high stability because the reflected signals from the two identical gratings are dropped or added not by interference but by polarizations of the beams. We could add and drop not noly 1549.3nm signal channel(original gratings), but also 1550.1nm(tuned gratings) with PZT actuators and in both cases, we found that the rejection of adjacent channels was more than -26dB, and signal leakage at the gratings was less than -34dB.

두부 전방전위 자세가 젊은 성인들의 호흡기능에 미치는 영향

김세윤,김난수,정주현,조명래,Kim, Se-Yoon,Kim, Nan-Soo,Jung, Ju-Hyeon,Jo, Myeong-Rae 대한물리치료학회 2013 대한물리치료학회지 Vol.25 No.5

Purpose: Forward head posture is a typical symptom in people who use computers for long periods of time. Respiration is a complex function involving co-operation of muscular, skeletal, and nervous systems. Abnormal posture can have a negative effect on respiratory function. The purpose of this study was to investigate the relationship between forward head posture and respiratory function in young adults. Methods: Forty-six healthy subjects participated in this study. Craniovertebral angle was measured for assessment of the forward head posture. The respiratory function of all subjects was evaluated by measuring forced vital capacity (FVC), forced expiratory volume at one second (FEV1), forced expiratory volume at one second/forced vital capacity (FEV1/FVC) ratio, and peak expiratory flow (PEF). The baseline of forward head posture was less than 49 degrees. Results: : Significant differences for predicted FVC and FEV1 were observed between the two groups, however, no statistically significant differences in FEV1/FVC ratio and PEF were observed between the two groups. Conclusion: Results of this study demonstrate that forward head posture has a negative effect on respiratory function in young adults.

삼정환(三精丸)이 대식세포의 면역반응에서 유도되는 $IL-1{\beta}$ 유전자의 발현에 미치는 영향

김세윤,정지천,Kim, Se-Yoon,Jeong, Ji-Cheon 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.1

Objectives : Macrophage has an important innate defense role in the immune system. When we are infected with pathogens, macrophage ingests them through phagocytosis or endocytosis, and then secretes many cytokines, such as IL-1, IL-6 and $TGF{\alpha}$, which are regulators of immune responses. The aim of this study is to determine how Samjunghwan effects the expression of cytokine and other immune-related genes in macrophages. Methods : Cells were treated directly with Samjunghwan and/or LPS at regular intervals. Total RNA of cells was isolated using TRIzol reagent, and the changes in cytokine gene expressions were investigated using RT-PCR, western blot and ELISA. Results : $IL-1{\alpha},\;IL-1{\beta}$ and COX-2 genes were inducibly expressed specifically by Samjunghwan in macrophage. Especially, $IL-1{\beta}$ gene was induced most strongly by treatment with Samjunghwan. Over time, treatment with Samjunghwan showed that the expression levels of $IL-1{\alpha}\;and\;$IL-1{\beta}$ genes increased from 1 to 4h, and then decreased from 4 to ISh. However, the expression level of COX-2 gene increased continuously up to 11h. $IL-1{\alpha},\;IL-1{\beta}$ and COX-2 genes were expressed synergistically by a simultaneous treatment of both Samjunghwan and LPS in macrophages. Secretion levels of translated $IL-1{\beta}$ increased continuously up to 11h. Conclusions : Though this study is only a start in the investigation of the efficasy of Samjunghwan, these results suggest that Samjunghwan has positive effects on immune responses.

인공신경망 기반의 풍력발전기 발전량 예측에 관한 연구

김세윤(Se Yoon Kim),김성호(Sung-ho Kim) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.11

The power generated by wind turbines changes rapidly because of the continuous fluctuation of wind speed and direction. It is important for the power industry to have the capability to predict the changing wind power. In this paper, neural network based wind power prediction scheme which uses wind speed and direction is considered. In order to get a better prediction result, compression function which can be applied to the measurement data is introduced. Empirical data obtained from wind farm located in Kunsan is considered to verify the performance of the compression function.

IR 카메라 기반의 풍력발전용 고장검출 시스템 개발

김세윤(Se-Yoon Kim),김성호(Sung-Ho Kim) 한국지능시스템학회 2012 한국지능시스템학회논문지 Vol.22 No.6

최근 풍력발전은 전 세계적으로 전기의 생산을 위해 사용되는 신재생 에너지원 중 가장 빨리 성장하고 있는 분야이다. 일반적으로 풍력발전 시스템은 설치 후 약 20년 동안 사용될 수 있도록 설계되며 따라서 장기간 운전할 경우, 풍력 발전기에서의 고장은 필연적으로 발생하게 된다. 특히 풍력발전 시스템의 너셀 내부에는 로터샤프트, 기어박스 및 발전기 등이 설치되며 이들 요소의 정상적인 동작을 보장하기 위한 각종 냉각 시스템이 설치된다. 만일 이들 냉각 시스템에 고장이 발생된다면 전체 풍력발전시스템의 정상적인 동작을 보장하는 것이 불가능하다. 이에 본 연구에서는 풍력발전 시스템 너셀 내부에 설치되는 각종 냉각장치의 고장을 미연에 방지 할 수 있게 하는 IR 카메라 기반의 풍력발전용 고장검출 시스템을 제안하고 실제 시스템의 구현을 통해 제안된 기법의 유용성을 확인하고자 한다. Wind energy is currently the fastest growing source of renewable energy used for electrical generation around the world. Generally, wind turbine systems are designed to be operated for twenty years long, Therefore, various faults in the wind turbine system inevitably occur during their long term period of operation. Especially, rotor shaft, gear-box and generator are installed inside of nacelle, furthermore, some cooling systems for normal operation of these devices are also required. If these cooing systems have failed in their operation, it is impossible for the entire system to be operated normally. In this work, IR(Infra Red) camera based fault detection system for the preventive detection of various cooling systems faults is proposed. To verify the applicability of the proposed system, physical implementation is embodied and various experiments are carried out.

소형 풍력발전시스템의 성능 분석을 위한 무선 원격 모니터링 시스템 개발

김세윤(Se-Yoon Kim),안성일(Sung-il An),김성호(Sung-Ho Kim) 한국지능시스템학회 2012 한국지능시스템학회 학술발표 논문집 Vol.22 No.1

최근 화석에너지의 고갈에 대비한 친환경적인 대체 에너지원으로 풍력발전이 주목을 받고 있다. 특히 10kW 이하 소형 풍력발전 시스템은 전 세계에서 개발 되고 있다. 상업적인 목적으로 설치되는 소형 풍력발전 시스템에 대해 성능 인증이 필요한데 이를 위해 효율적인 무선 모니터링 시스템이 개발 되어야 한다. 본 논문에서는 지그비 기반 무선 원격 모니터링 시스템의 새로운 유형을 제안한다. 또한, 제안된 기법의 타당성을 확인하기 위해 실제 소형 풍력발전 시스템에 도입하여 유용성을 확인하였다.