Failure Diagnosis Method of Photovoltaic Generator Using Support Vector Machine

Kyeong‑Hee Cho,Hyung‑Chul Jo,Eung‑sang Kim,Hyang‑A. Park,박준호 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

The capacity of photovoltaic (PV) generators can increase owing to the 4030 policy of the Government of South Korea.. In addition, there has been signifcant interest in developing a technology for the maintenance of PV generators owing to an increase in the number of outdated PV generators. This paper describes a failure diagnosis method that uses operational data for power generation and solar radiation of PV generators. The measured data stored since four years in an operational 50-kW PV generator that was installed in 2014, were analyzed. The proposed failure diagnosis logic uses support vector machine classifcation as a failure diagnosis method that can classify normal and failure data. The failure data were processed to be used as the fault diagnosis logic for solar power generators. A new 50-kW PV generator, which contained no fault data, was used for a case study in this paper. Fault data were generated and the operation data of the PV generators were diagnosed by applying the proposed method. In addition, the accuracy was calculated and the results were analyzed.

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.

국가기술 검정시험을 위한 건축교육방법에 관한 연구

조중근,이경락,정성진 永同工科大學校 1996 硏究論叢 Vol.2 No.1

본 연구는 건설공학부 건축전공 재학생들의 국가기술자격 취득율을 높여 졸업후 진로 선택에 유리한 고지를 선점할 수 있도록 하기 위한 것으로서, 국가기술자격 취득율 제고를 위한 교육방법 및 수학기간 중 건축관련 실무지식 함양에 그 목적을 두고 있다. 본 연구의 연구 범위 및 내용은 건축분야 국가기술자격 시험의 중심과목인 건축론 및 건축사, 건축계획, 건축구조 분야가 중심이 되고 있다. 각 분야별 인구의 세부 내용은 건축론 및 건축사분야의 경우, 1)실내디자인, 색채학, 인간공학, 건축사(한국,서양,현대)에 관한 교재 조사, 2)학습능력 및 수준의 평가조사, 3)색의 이론 및 실습, 건축사 요약 강의 4) 인간공학 교과목보강교육, 한국건축사 및 형태 의장 보충 교육, 5)건축의장 기사 및 건축기사1급(건축론 및 건축사)검정시험 대비 문제풀이 등을 중심으로 이루어지고 있다. 한편 건축계획분양의 경우, 1) 건축계획 및 설계에 관한 출판사별 문제집 및 참고도서를 수집, 2)학습능력 및 풀이 수준평가, 3)국가기술자격 검정시험대비 문제 풀이 및 해설, 4)학습지취도의 평가 및 개선 방향의 검토 등으로 이루어지며, 건축구조 분야의 경우 1)구조역학, R.C.구조설계 및 철골조 설계에 관한 교재 조사, 2)학습능력 및 수준조사 평가, 3)역학 학습에 필요 한 물리 및 수학 기초교육, 4) 국가기술자격검정시험 대비 문제 풀이 및 해설 등을 중심내용으로 하고 있다. 본 연구의 진행방법으로는 3학년 학생들의 경우, 각 조별로 각기 다른 문제집을 선정한 후, 각 조원이 자신있는 과목을 선정하여 문제풀이 및 출제빈도수에 대한 분석을 행함으로서, 추약부분의 추출 및 해결방법을 고안하는 방향으로 진행하였으며, 2학년 학생들의 경우 기초과목 기사출제경향 및 흐름을 파악하고 1학기에 설강된 교과목에 다한 보충강의 및 기출문제 중 빈도가 높은 문제들을 집중학습하는 방향으로 진행되었다. This study is on the educational students majoring in architectural engineering. The goal of this study is to raise the passing ratio of the National Qualifying Examination for Technology and develop practical knowledges within the study. The theory of architecture, the history of architecture, the planning method in architecture, and the mechanics of building structures, which are entral subjects for the National Qualifying Examination for Technology, contents treated by this study. In the case of the theory of architecture and history of architecture, 1) the investigation of texts for interior design, human engineering and the history of architecture, 2)the estimation of lesming capacity, 3)the theory and practice of color, the summary of the history of architecture, 4)the supplementary lecture about the human engineering, and 5) the exercise for the preparation to the National Qualifying Examination for Technology are treated in detail. In the case of planning method in architecture, 1)the investication of texts and references according to the publishing copanies, 2)the estimation of lesrning capacity, 3)the exercise for the preparation to the National Qualifying Examination for Technology and 4) the evaluation of the degree of progress in lesrning are advances in detail. Finally in case of mechanics fo building structures, 1) the ivestigation of texts for mechanics of structures, reinforced concrete design, and steel structure design, 2)the estimation of lesrning capacity. 3) the lecture for the basic concepts in physics and mathmetics, which are necessary in learning mechanics, 4)the exercise for the preparation to the National Qualifying Examination for Technology are treated seriously. Finally, this study is accomplished according to student groups. In the case of third year students, they select the aplicable texts and subjects, analyze the frequencies of problems. draw their weak points, and propose some ideas for solution simultaneously. In the case of sophomores, they analyze the basic trends of the National Qualifying Examination for Technology, and exercise the frequent problems repeatedly.

일반계 고등학교 교육과정 특성화 방안 연구 : 예체능 과정 설치를 중심으로

홍후조,강익수,백경선 한국교육방법학회 2009 교육방법연구 Vol.21 No.2

This study deals with the problem of enlarging the kinds of courses of academic high schools by installing the ‘core’ school with particularized curriculum such as arts or physical education course tracks as well as academic tracks. For last 60 years Korean general high school have operated two tracks, humanities and social science track, and natural science track. Two traditional tracks did not meet the needs of students and society. Survey were administered to secondary school students and teachers, asking about the curricular needs of new tracks. Based on the results of questionnaires the simulation of allocating students and teachers, and installing facilities according to the curricular tracks was finished. About 30% of middle school graduates want to go to core high schools with particular track rather than traditional tracks.

건축공학전공 졸업예정자들의 기술자격증 취득 및 취업증진에 관한 연구

이경락,조중근,정성진,전진용 永同大學校 1997 硏究論叢 Vol.3 No.1

본 연구는 건축공학 전공학생들의 졸업 후 진로 결정을 증진시키는 종합적인 방안을 모색하기 위한 것으로서, 우선적으로 건축전공 졸업자예정자들의 국가기술자격검정에의 합격률을 제고시키고, 그 결과에 따른 졸업 후 진로의 대책을 마련하는 것을 목적하며 세부사항은 다음과 같다. 1. 국가기술자격 취득률 제고를 위한 교육방법 2. 수학기간 중 건축관련 실무지식 함양 3. 관련업계와의 연계 구축 4. 산업체의 수요에 대한 교육에의 피드백 The purpose of this study is to search for the comprehensive and concrete methods of increasing the graduates' employment based on both fundamental and advanced knowledge concerned urban engineering major. For thi, existing condition, problems and improvement of students employment are searched in 3 view points such as strengthening of technical education to follow the social demands, enhancement of acquisition of the national qualifying examination and making the best of the field training system.

초등 교사의 수학에 대한 신념과 수학수업의 관계

이경화,안금조 淸州敎育大學校 初等敎育硏究所 2002 初等敎育硏究 Vol.12 No.-

The purpose of this study is to investigate what character elementary teacher's beliefs and attitudes about mathematics affect mathematics teaching practices in school. For this goal : (1) Designing questionnaire to measure elementary teacher's beliefs and attitudes about mathematics (2) Inquiring into character of elementary teacher's beliefs and attitudes about mathematics after analyzing questionnaire (3) Analyzing two teachers' mathematics teaching practices to understand how teacher's beliefs and attitudes affect mathematics teaching practices As a result of questionnaire analysis, beliefs about mathematical essence is between 'yes and no' and 'generally yes', beliefs about mathematics learning is near 'generally yes', beliefs about mathematics teaching is between 'yes and no' and 'generally yes', and beliefs about mathematics teaching practices inclines to 'generally yes'. The analysis of mathematics teaching practices shows that teacher's beliefs and attitudes about mathematics influence organizing and developing contents of instruction. Teacher L thinks that the important purpose of teaching mathematics is to develop problem solving skill of students and to help students to think mathematically. Teacher L's beliefs about mathematics teaching shows that L gives student-centered lessons and takes a role as a helper. Teacher K thinks that the teacher has to use more ways to teach one concept and to explain in detail. Teacher K's beliefs and attitudes about mathematics teaching show that K uses pictures, concrete materials or examples to explain in detail.

艾靑의 生涯 硏究

兪景朝 한국중국문화학회 1995 中國學論叢 Vol.4 No.-

살색정보와 움직임 정보를 이용한 영상분석

도경훈,정의윤,조정복 東西大學校 2000 동서논문집 Vol.6 No.-

Objects-based coding algorithms segment image contents into set of objects or regions according to a given model and estimate their parameters like motion, shape, and color. It is known that object-based coding is more efficient coding method in videophone image sequence. It is difficult to detect moving object only using motion information. Chromaticity distribution of skin color is similar region independent of human race. This paper presents efficient image analysis method using both skin color and motion. The proposed algorithm is composed of facial region detection using skin color and region detection using motion information.

음성 인식 헬스케어 시스템

신진우,조우승,조성빈,김재훈,정지은,사예지,백경동,박동규 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2

As modern people's interest in health grows, wearable healthcare-related technologies that can collect biometric information and receive health-related services regardless of time and place are developing. This paper proposes the healthcare system based on voice recognition function. Unlike conventional wearable healthcare systems, the proposed system provides real-time telemedicine and diagnosis and the direct connection with doctors is possible through it. And almost all functions of the application in it are operated with voice commands to lower user access barriers. Because it deals with personal information including medical information, encryption algorithms have been applied between all data movements. Finally, the healthcare system proposed in this paper is expected to increase convenience in health care and reduce the medical gap.

도산지수를 이용한 부실예측에 관한 연구

심갑용,정호섭,조경선 전북대학교 산업경제연구소 1999 전북대학교 산업경제연구소 논문집 Vol.30 No.-

어떤이 일이 일어나기 전에 그것을 예측하는 것은 그것이 어떤 일이든지 그리 간단하지는 않다. 특히 지진예측은 불가능에 가까울 정도로 어려운 일이라고들 한다. 그에 비해 도산을 사전에 예측하는 것은 훨씬 쉽다. 왜냐하면 지진은 지구의 지각구조가 갑자기 일으키는 현상으로서 그 구조가 충분히 해명되어 있지 않은데 비해, 기업의 도산은 사람이 기업활동을 통해 일어나는 결과로서 그 메커니즘을 상당히 정확하게 파악할 수 있기 때문이다. 기업의 도산은 개인행동이나 기업행동으로서 감지 할 수 있으며 소문이나 기업의 분위기도 기업의 부실이나 도산을 예측하는 중요한 판단 자료일 수 있다. 그러나 이러한 인지보다는 기업이 제공하는 재무자료를 통해서 그 기업의 경영상태나 재무상태를 알 수 있기 때문에 재무정보를 바탕으로 신뢰성있는 기업의 부실이나 도산을 예측할 수 있다. 본 연구에서 도산지수라는 새로운 개념을 도입하여 기존의 연구들이 가지고 있는 기업부실예측의 한계점에 극복하고자 한다. 이를 위해서 본 연구에서는 기존의 연구들이 사용하는 재무비율변수를 그대로 사용하지 않고 기업의 부실이나 도산의 예측에 좀 더 적합하도록 하기 위해 수정한 재무비율변수를 사용할 것이다. 따라서 기존연구에서 사용된 재무비율과 상당히 다르다. 이러한 재무변수로 통계적 기법을 사용하여 부실기업과 비부실기업간의 차이 분석을 통해 결과를 도출하고 이렇게 도출된 변수로 도산지수라는 개념을 사용하여 기업의 부실을 쉽고 용이하게 예측하고자 했다. 그 결과 연구가설에서 설정한 5가지 재무변수를 검증한 결과 부실기업과 비부실기업간의 차이가 매우 유의적으로 나타났으며, 또한 부실전 3년간의 부실기업의 도산지수가 1.0보다 상당히 작게 나타났으며 비부실기업의 도산지수는 1.0보다 크지는 않지만 1.0에 매우 근접해 있었다. 이러한 결과를 바탕으로 도산지수를 이용하여 부실기업을 예측하는데 일반화 가능성을 확인 할 수 있었다. 본 연구에서는 사례연구도 병행하여 그 적용을 타진해보았다.