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광섬유 내의 산란광을 이용한 분포형 온도 센서 시스템에 관한 연구
閔俊基,崔成求,盧度煥 全北大學校 1996 論文集 Vol.41 No.-
A distributed temperature sensor using optical fiber can monitor temperature at every point along its length. It is based on OTDR using Raman scattering, and optical fiber itself is used an sensing device. It detects weak Raman scattering intensities generated at various point along the optical fiber path. The temperature distribution is derived from the intensity of the Raman scattering light and the time between light injection and signal detection. In this paper, the principle of sensing, the system design and the results of experiments are reported.
민준기,Min, Jun-Ki 한국정보처리학회 2007 정보처리학회논문지D Vol.14 No.3
XML 데이터가 웹 상의 데이터 표현 및 교환의 표준으로 각광 받음으로써, XML에 대한 관심이 증대되고 있다. XML 문서의 구조 정보는 몇 가지 중요한 역할을 수행한다. 이러한 중요성에도 불구하고 XML 문서의 구조정보는 필수 요소가 아니다. 따라서, 이러한 구조 정보를 추출하기 위한 다양한 연구들이 진행되어 왔다. 본 논문에서, 우리는 XML 문서를 위한 간결하고 정확한 DTD를 추출하는 기법을 제안한다. 특히 XML 문서의 구조 정보를 위한 DTD의 내용 모델을 DTD와 XML Schema의 혼합 내용(mixed contents)의 타당성 제약 조건을 이용하여 제한하고 본 논문에서 제안하는 몇 가지 경험적 규칙들을 적용함으로써, 우리는 간결성과 효율적을 이룩하였다. 실제 DTD를 이용한 실험을 통하여 본 논문에서 제안하는 기법이 기존의 접근 방법들에 비하여 뛰어남을 보였다. There has been an increasing interest in n since it is spotlighted as the standard for data representation and exchange in the Web. The structural information for XML documents serves several important purposes. In spite of its importance, the schema is not mandatory for XML documents. Thus, much research to extract structural information for XML document has been conducted. In this paper, we present a technique for efficient extraction of concise and accurate DTD for XML documents. By restriction of DTD content model using the mixed content model of DTD and XML Schema as well as applying some heuristic rules proposed in this paper, we achieve the efficiency and conciseness. The result of an experiment with real life DTDs shows that our approach is superior to existing approaches.
태양광 마이크로 컨버터 (Power Optimizer) 기술 동향
민준기 한국태양광발전학회 2018 한국태양광발전학회지 Vol.4 No.2
태양광 마이크로 컨버터(국내에는 Power Optimizer로 알려져 있다)는 태양광 발전 시설에서 모듈간, 스트링 간 발생하는 다양한 미스매치의 영향으로 발전량이 감소하는 현상에 대처하고 모듈레벨 모니터링 및 Rapid Shutdown과 같은 DC 레벨 안전 기능 등을 제공하는 최신 기술이다.[1,2] 국내에는 아직 생소 하지만, 해외에서는 이미 마이크로 컨버터의 효용성이 입증 되어 태양광 발전시스템에서의 적용이 증가하고 있으며, 특히, 미국의 가정용 태양광시장에서 마이크로컨버터 제품의 시장점유율이 급속히 증가하고 있다.
다중감각 되먹임 장치를 이용한 자가 일어서기 훈련이 편마비 환자의 균형능력과 일어서기 동작 수행능력에 미치는 영향
민준기,최원재,정지혜,이승원 대한고유수용성신경근촉진법학회 2022 PNF and Movement Vol.20 No.2
Purpose: The aim of this research was to investigate the effects of self-sit-to-stand training on balance ability and sit-to-stand ability in hemiplegic stroke patients using a multisensory feedback device. Methods: A total of 19 stroke patients participated in this study, and they were divided into two groups: 10 underwent self-sit-to-stand training using a multisensory feedback device, and 9 underwent sit-to-stand training with a physical therapist. In both groups, sit-to-stand training was performed for 30 min, 3 times a week, for 6 weeks. The subjects also underwent physical therapy twice a day for 30 min, 10 times a week, for a total of 60 sessions. Balance ability was evaluated using the AFA-50 and Berg Balance Scale. Sit-to-stand ability was evaluated using the five times sit-to-stand test. Results: Sway length, pressure, and total pressure all significantly increased in both groups, and there was no difference between the two groups. The Berg Balance Scale results showed that balance ability significantly increased in both groups, and there was no difference between the two groups. The five times sit-to-stand test results showed that sit-to-stand ability significantly increased in both groups, and there was no difference between the two groups. It was found that the self-sit-to-stand training using a multisensory feedback device had a positive effect on balance control and sit-to-stand ability. When the two groups were compared, no difference in balance ability or sit-to-stand ability was observed. Conclusion: The findings of this study indicate that self-sit-to-stand training using a multisensory feedback device is as effective as sit-to-stand training with a physical therapist. Hence, self-sit-to-stand training using a multisensory feedback device could be an effective home-based exercise protocol for hemiplegic stroke patients to improve their balance and sit-to-stand abilities.