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박규남(Kyu-nam Park),송명현(Myung-hyun Song),양철오(Chul-oh Yang),김형진(Heung-jin Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 연구에서는 경 부하 구간에서 유도전동기의 회전자 바고장 진단을 개선하는 방법을 제안하였다. 유도전동기의 회전자 바 고장 진단에 있어 25% 이하의 경 부하에서 정확한 진단이 어렵다. 경 부하에서는 종래의 방법에서 적용했던 회전자 바 고장 특징주파수 대역과 다른 특징 주파수 대역을 적용하여 진단하는 방법을 제안하였다. 기존에 진단이 어려웠던 경 부하에서 유도전동기 회전자 바 고장 진단을 개선하는 방법을 제안하고 실험을 통해 그 타당성을 입증하였다.
송상섭(Song Sang-Sup),박규남(Park Gyu-Nam),곽민수(Kwak Min-Soo) 한국IT서비스학회 2009 한국IT서비스학회 학술대회 논문집 Vol.2009 No.3
본 논문에서는 업무맞춤메뉴를 설계하여 기존의 연구지원포털에 구현하였고 사용로그를 분석하여 맞춤메뉴 사용비율과 설정유형의 2가지 측면에서 효과를 평가하였다. 사용비율은 연구지원포털의 트리구조메뉴 대비 업무맞춤메뉴의 사용횟수를 비교한 것인데 트리구조메뉴의 메뉴항목수 대비 업무맟줌메뉴의 항목수는 10%에 불과하지만 업무맞춤메뉴를 사용한 비율은 43%로서 업무맞춤메뉴의 사용비율이 상대적으로 대단히 높은 것으로 나타났다. 설정유형으로는 (1) 사용자별로 사용빈도가 높은 메뉴를 종합하여 모아둔 유형, (2) 담당업무에 자주 사용하는 메뉴를 종합해서 모아둔 유형, (3) 동일업무를 자주 반복하다보면 메뉴사용순서가 자연스럽게 정해지므로 사용순서 기반으로 메뉴를 설정한 유형의 3종류를 식별할 수 있었다. 이것은 사용자들이 자신의 필요성에 맞추어 적절하게 맞춤메뉴를 설정사용하고 있다는 것을 보여주는 것으로 해석된다. 분석결과로부터 사용편의성 측면에서 업무맞춤메뉴의 도입효과가 뛰어나고 사용자들의 자발적인 설정사용을 확인할 수 있었다. 또한 사용빈도가 낮은 메뉴항목까지 맞춤메뉴화 할 필요는 없으므로 트리구조메뉴와 병행하여 맞춤메뉴를 도입하는 것이 바람직하다는 점도 알게 되었다.
LabVIEW를 이용한 휴대용 3상 소형유도전동기 회전자 바 고장 진단 시스템 개발
宋明現(Myung-Hyun Song),朴奎南(Kyu-Nam Park),韓東奇(Dong-Gi Han),李泰勳(Tae-Hun Lee),禹奕在(Hyeok-Jae Woo) 대한전기학회 2007 전기학회논문지 P Vol.56 No.1
In this paper, a portable rotor bar fault diagnosis system for small 3 phase induction motors is suggested. For portable real-tine diagnosis system, an USB- DAQ board for collecting the 3 phase current data, three current probes, and a notebook computer are used. The LabVIEW graphical language is used for filtering, analysis, storing, and monitoring the current data. The three phase stator current are filtered and transformed to frequency level by FFT. An analysis window programed by LabVIEW is located in front panel to show the FFT results and this suggested window has a zooming function to detect the fault feature more easily near the feature frequency range which is varying by the slip frequency. To show the possibility of portable rotor bar diagnosis system, three types(healthy, one rotor bar fault, two rotor bar fault) of rotor bar are intentionally prepared and compared by the suggested window of front panel. Experimental results are shown that a suggested diagnosis system is applicable to portable diagnosis system and the rotor bar fault is detected by the frequency window in front panel programed in LabVIEW graphical language.
Soo-Hyun Kim,박규남,Chun Song Youn,Minjung Kathy Chae,김원영,이병국,Dong Hoon Lee,장태창,이재훈,최윤희,Je Sung You,In Soo Cho,Su Jin Kim,이종석,Yong Hwan Kim,Min Seob Sim,신종환,박유석,이영환,문형준,Won Jung Jeong,오주석,Seung Pill Choi 대한응급의학회 2020 Clinical and Experimental Emergency Medicine Vol.7 No.4
Objective High-quality intensive care, including targeted temperature management (TTM) for patients with postcardiac arrest syndrome, is a key element for improving outcomes after out-of-hospital cardiac arrest (OHCA). We aimed to assess the status of postcardiac arrest syndrome care, including TTM and 6-month survival with neurologically favorable outcomes, after adult OHCA patients were treated with TTM, using data from the Korean Hypothermia Network prospective registry. Methods We used the Korean Hypothermia Network prospective registry, a web-based multicenter registry that includes data from 22 participating hospitals throughout the Republic of Korea. Adult comatose OHCA survivors treated with TTM between October 2015 and December 2018 were included. The primary outcome was neurological outcome at 6 months. Results Of the 1,354 registered OHCA survivors treated with TTM, 550 (40.6%) survived 6 months, and 413 (30.5%) had good neurological outcomes. We identified 839 (62.0%) patients with presumed cardiac etiology. A total of 937 (69.2%) collapses were witnessed, shockable rhythms were demonstrated in 482 (35.6%) patients, and 421 (31.1%) patients arrived at the emergency department with prehospital return of spontaneous circulation. The most common target temperature was 33°C, and the most common target duration was 24 hours. Conclusion The survival and good neurologic outcome rates of this prospective registry show great improvements compared with those of an earlier registry. While the optimal target temperature and duration are still unknown, the most common target temperature was 33°C, and the most common target duration was 24 hours.
LabVIEW를 이용한 소형 유도전동기의 권선고장 자동진단
宋明現(Myung-Hyun Song),朴奎南(Kyu-Nam Park),韓東奇(Dong-Gi Han),禹奕在(Hyeok-Jae Woo) 대한전기학회 2006 전기학회논문지 P Vol.55 No.4
In this paper, an auto detection method of stator winding fault of small induction motor is suggested. The Park's vector pattern which is obtained from 3-phase current signal by d-q transforming, is very good to detect winding fault. Comparing the Park's vector pattern of testing motor with its of healthy motor, the Park's vector pattern of fault motor is became an ellipse and the asymmetry is increased by the winding fault serios. So for detecting the dis-symmetry, id-filtered function, Min-value, and Max-value are suggested for auto detecting. Using LabVIEW programing, 3-phase healthy motor and several kind of winding fault motors are tested and the test results are shown that the suggested method can gives us a possibility of an auto detecting winding fault.
산업용 Ethernet을 이용한 PC기반 패널작업 보아시스템 구축
宋明現(Myung-Hyun Song),朴奎南(Kyu-Nam Park),韓東奇(Dong-Gi Han),禹奕在(Hyeok-Jae Woo),廉圭日(Gyu-Il Youm) 대한전기학회 2007 전기학회논문지 P Vol.56 No.2
In this paper, one type of a security system for panel working is suggested. The industrial Ethernet is used for open-close door control of the working panel and for monitoring the working panel is correct or not. Especially to upgrade the security system, a remote approval function of panel working by using the given approval number, a remote monitoring function for checking the approved panel is currently working or not, and an alarming function for keying the unapproved number or opening the disapproved panel, are added for preventing and reducing the intentional working error. Also the worker and working time are stored in PC automatically in exel file for detecting the working error. To show the possibility of suggested security system. two-working panel system is prepared and studied.
예비 교사와 과학 교사의 탐구수업에 대한 선호도 차이 분석
송하영 ( Ha Young Song ),박규남 ( Gyu Nam Park ),김영신 ( Young Shin Kim ) 경북대학교 중등교육연구소 2009 중등교육연구 Vol.57 No.2
이 연구의 목적은 예비 교사와 과학 교사의 탐구수업에 대한 선호도 차이를 알아보기 위한 것이다. 충북지역 K 대학교와 대구시의 K 대학교에 재학 중인 예비 교사 112명과 중등학교에 근무하는 과학 교사 220명을 대상으로 탐구수업에 대한 인식, 학생행동, 교사행동, 자료 수집 및 활용 4개의 범주로 된 설문을 실시하였다. 이 결과 전체 영역에서는 예비 교사가 과학 교사보다 높았으며 통계적으로 유의미한 차이가 있었다(p<0.05). 그리고 범주별로는 탐구수업에 대한 인식과 자료 수집 및 활용 영역에서 통계적으로 유의미한 차이(p<0.05)를 나타내었으나 학생행동, 교사행동 영역에서는 두 집단 간에 유의미한 차이를 나타내지 않았다(p>0.05). 이 연구 결과에 기초하여 과학 교사의 탐구수업에 대한 선호도를 높이기 위한 구체적인 전략과 탐구수업이 실제 현장에서 어떻게 이루어지고 있는지에 대한 연구가 이루어지길 기대한다. The purpose of this study was to analyze the differences between pre- service teachers` and science teachers` preferences on inquiry based instruction. Data were collected from 112 pre-service teachers from K University in Chungbuk Province, K University in Daegu and 220 science teachers working in secondary school. Questionnaire was consisted of 4 categories; recognition for inquiry based instruction, student behavior, teacher behavior, data collection and application. The results were as followings: First, on total category pre-service teachers had higher preferences than science teachers and there were significant differences(p<0.05). And on recognition for inquiry based instruction and data collection and application category significant differences were found(p<0.05) but there weren`t significant differences on student behavior and teacher behavior category between two groups(p>0.05). Based on the result of this research, research about these topics are expected to continue: specific strategies to increase science teachers` preferences about inquiry based instruction and inquiry based instruction in the field.
유도전동기의 고정자 권선고장 진단을 위한 팍스벡터 패턴의 왜곡률 연산에 대한 연구
양철오(Chul-Oh Yang),박규남(Kyu-Nam Park),송명현(Myung-Hyun Song) 대한전기학회 2012 전기학회논문지 Vol.61 No.4
The diagnosis technique of stator winding faults based on Motor Current Signature Analysis(MCSA) was suggested. Park"s vector pattern, the circle that is drawn by d-q transformed currents(i<sub>d</sub>, i<sub>q</sub>), is widely used for stator winding faults detection. The current Distortion Ratio(DR), defined by the ratio of max?axis and min?axis of ellipse of Park"s vector"s pattern, was more simple and powerful method than the Park’s vector pattern. In this study, a calculation method of distortion ratio of Park"s vector pattern was suggested for auto diagnosis of stator winding short fault and usefulness of suggested calculation method of distortion ratio was verified through simulation using LabVIEW program.
RSH를 이용한 정상상태 운전 유도전동기의 회전속도 추정
양철오(Chul-Oh Yang),박규남(Kyu-Nam Park),송명현(Myung-Hyun Song) 대한전기학회 2011 전기학회논문지 Vol.60 No.9
The slip frequency is included in feature frequency for fault diagnosis of rotor bar, so rotating rotor speed is needed. In this study, rotor slot harmonic(RSH) method is suggested for speed estimation of induction motor. When the rotor is rotating, motor current signal include the harmonic signal of back-emf voltage related with number of rotor slot. So from the power spectrum of current signal, the rotor speed can be founded. This method of rotor speed estimation gives the slip frequency, and the feature frequency of rotor bar fault can be calculated. Comparing with stroboscope speed meter, the error rate of suggested method is less than 0.1[%].