동력전달용 타이밍벨트의 강성 개선

이경연,변경석 한국융합신호처리학회 2022 융합신호처리학회 논문지 (JISPS) Vol.23 No.1

타이밍벨트는 동력전달 요소로서 V벨트와 기어의 장점을 살린 톱니붙이 전동 벨트로서 미끄러지지 않고 소음도 적어 기구에서 회전축이나 직선 운동에서 동력을 전달할 때 동력 전달 장치로 사용되고 있다. 기어처럼 등간격의 홈을 가진 벨트 풀리와 홈에 정확히 맞물리도록 동일한 간격의 홈을 가진 타이밍 벨트를 통해 회전을 정확하게 전달할 수가 있다. 특히 출력축에 타이밍벨트가 사용된 메커니즘에서 타이밍벨트의 강성을 포함한 동적 특성이 시스템 전달 특성을 결정하게 되므로 그 중요성이 커진다. 본 논문에서는 제한된 범위의 움직임을 갖는 타이밍 벨트에 적용하여 강성을 증가시킬 수 있는 강성 강화 벨트를 제안하였다. 강성 강화 벨트의 동특성을 연구하기 위하여 강성 강화 벨트에 대한 운동방정식을 수립하고, 강성 강화 벨트에 대한 시뮬레이션 모델을 만들어 분석을 수행하였다. 운동 방정식과 시뮬레이션 모델의 분석 결과를 확인하기 위하여 강성 강화 벨트를 사용한 1축 회전 실험 장치를 제작하고 실험을 수행하였다. 운동 방정식, 시뮬레이션 모델, 실험을 통하여 제안한 강성 강화 벨트를 적용하면 타이밍벨트의 강성과 동특성을 개선할 수 있음을 확인하였다.

병원급식의 효율성 : 환자의 신뢰도에 중점을 두어 With the Emphasis of Confidence Concerning Foods for Hospital Patients

이경연 연세대학교 생활과학대학 1992 婦學 Vol.25 No.-

두피 피부 무형성증을 동반한 양막대증후군 1례

이경연,김자형,정진영,박상규,김준성,오기원 대한신생아학회 2009 Neonatal medicine Vol.16 No.1

The amniotic band syndrome is an uncommon congenital fetal abnormality, presumably due to fetal entanglement in strands of ruptured amniotic sac. The defects caused by this syndrome vary from simple limb defects to major visceral and craniofacial defects. We cared for a newborn infant with this syndrome, who showed constriction rings of the right leg and right axilla, right club foot, thoracic scoliosis, polydactyly, absence of the right thumb and aplasia cutis of the scalp. We report this case with a brief review of the literature.

식품접객업소의 작업장 시설ㆍ설비의 위생실태에 관한 연구 : 경상남도 창원시를 중심으로

이경연,송양순,이경혜 창원대학교 생활과학연구소 2000 생활과학연구 Vol.4 No.-

This study was investigated to develop the program of sanitary education which improves sanitary levels of restaurants, nutritional service, and safety of consumers. The subjects of 264 restaurants, which were composed of 4 types of businesses (restaurant of korean-style food, japanese style raw fish, roasted ribs and western style food) were classified into 2 types(large scale, small scale). The sanitary condition of facilities and equipments in these restaurants were investigated by direct interview. Sanitations management of facilities and equipments, such as workplaces, knifes, chopping boards, dish towels, bowls, refrigerators showed problems. Although government office makes a lots of efforts to improve the sanitary condition, it has been found that there were many sanitary problems of restaurants in Chang-Won City. The result of this study may show overall sanitation aspect of the korean restaurants, however, there were not any references of other cities which we can compare with. Recently, big accidents of food poisoning were frequently happened in several places including Chang-Won. Therefore, it is necessary to establish the countermeasure to care for sanitation management of restaurant and food hygiene as soon as possible.

직하방과 빗각 촬영 운용을 위한 초분광 영상센서 구동방식에 관한 연구

이경연 한국군사과학기술학회 2019 한국군사과학기술학회지 Vol.22 No.4

General Hyperspectral Image Sensor acquires an image of line form such as a thin rectangle shape because of using 1D array Push Broom or Whisk Broom scanning method. A special mechanism is required for a Hyperspectral Image Sensor to operate for nadir and slant range. To design the mechanism, the characteristics of the flight motion and the overlap rate between consecutive frames were analyzed. Also, system requirements were proposed through modeling and simulation.

소아 신경-심인성 실신의 특징

이경연,이진영,김명현,이정은,김용대,이은주,임영수,김원섭 대한소아청소년과학회 2008 Clinical and Experimental Pediatrics (CEP) Vol.51 No.5

Purpose:Syncope is relatively common in children and adolescents. Among the etiologies of syncope, neurocardiogenical syncope is the most common, but it is often confounded with seizure. We investigated the clinical features of patients under the age of 15 with neurocardiogenical syncope, compared to patients with neurologic disorders including epilepsy. Methods:Among the children who visited the Department of Pediatrics at Cheongju St. Mary's Hospital and Chungbuk National University Hospital from March 2005 to February 2007, we retrospectively analyzed 69 patients whose chief complaint was syncope. We classified the patients by syncope etiology and made comparisons between the neurocardiogenical syncope (NCS) group and the neurological disorders (ND) group regarding to age; location; time and season in which syncope occurred; associated symptoms, including seizures, provocation factors; prodromes; duration of syncope; frequency of previous syncope; birth history; associated disease; past medical history; family history; neurological exam; physical exam; laboratory findings; electrocardiography; electroencephalography (EEG); head-up tilt test; brain CT; and MRI. Results:Among 69 syncope patients, 53 (76.8%) were in the NCS group and 11 (15.9%) were in the ND group. There were no statistically significant differences between the two study groups except for the presence of prodromes and EEG abnormalities. The presence of prodromes in the NCS group was more common than in the ND group [46.9% (23/49) vs. 9.1% (1/11), (P=0.038)]. The EEG abnormality in the ND group was more common than in the NCS group [90% (9/10) vs. 5.8% (3/52), (P<0.01)]. Conclusion:Our study suggests that detailed history-taking, including that concerning prodromes, is important for the accurate diagnosis of neurocardiogenical syncope, and EEG should be obtained if neurological disorders are suggested. (Korean J Pediatr 2008; 51:512-517) Purpose:Syncope is relatively common in children and adolescents. Among the etiologies of syncope, neurocardiogenical syncope is the most common, but it is often confounded with seizure. We investigated the clinical features of patients under the age of 15 with neurocardiogenical syncope, compared to patients with neurologic disorders including epilepsy. Methods:Among the children who visited the Department of Pediatrics at Cheongju St. Mary's Hospital and Chungbuk National University Hospital from March 2005 to February 2007, we retrospectively analyzed 69 patients whose chief complaint was syncope. We classified the patients by syncope etiology and made comparisons between the neurocardiogenical syncope (NCS) group and the neurological disorders (ND) group regarding to age; location; time and season in which syncope occurred; associated symptoms, including seizures, provocation factors; prodromes; duration of syncope; frequency of previous syncope; birth history; associated disease; past medical history; family history; neurological exam; physical exam; laboratory findings; electrocardiography; electroencephalography (EEG); head-up tilt test; brain CT; and MRI. Results:Among 69 syncope patients, 53 (76.8%) were in the NCS group and 11 (15.9%) were in the ND group. There were no statistically significant differences between the two study groups except for the presence of prodromes and EEG abnormalities. The presence of prodromes in the NCS group was more common than in the ND group [46.9% (23/49) vs. 9.1% (1/11), (P=0.038)]. The EEG abnormality in the ND group was more common than in the NCS group [90% (9/10) vs. 5.8% (3/52), (P<0.01)]. Conclusion:Our study suggests that detailed history-taking, including that concerning prodromes, is important for the accurate diagnosis of neurocardiogenical syncope, and EEG should be obtained if neurological disorders are suggested. (Korean J Pediatr 2008; 51:512-517)

국내 초등학교 발명교육 연구 현황 분석을 통한 유아교육에서의 방향 탐색

이경연,박은선 한국영유아교원교육학회 2016 유아교육학논집 Vol.20 No.3

This study examines the state of research on teaching invention to elementary school students in an attempt to ascertain the orientation of Early Childhood Education. For the purpose of this investigation, a total of 81 research papers and articles published in South Korean publications between 2000 and 2015 have been analyzed. The results of the literature review indicate the following: 2014 was the most active year in terms of the number of related publications (19), followed by 2013 (13) and 2009 (11). General students were the most frequently studied research subjects followed by talented youth, teachers and pre-service teachers. Students in the fifth and sixth grades were studied the most, followed by fourth, third, second, and first graders. In terms of methodology, quantitative research was used most often, followed by literature research, qualitative research and mixed methods research. Among the most discussed research topics – when listed in the order of frequency – were theory and contents analysis, program development and application, effect analysis and trend analysis these topics appear more or less in similar frequency. In terms of the possible approaches to invention education, researchers were most interested in teaching invention in living, followed by teaching focused on invention production, problem solving and the use of children’s stories. Concerning how the effectiveness of invention education should be analyzed, creativity was the most used criteria of evaluation, followed by attitudes toward invention and interest levels. Based on these results, this study further discusses potential directions for future investigation sand suggests the possible orientations that might be taken in Early Childhood Education. 본 연구는 초등학교 대상의 발명교육 연구 현황을 분석함으로써 유아교육에서의 방향을 탐색하는 것을 목적으로 하고 있다. 연구를 위해 2000년부터 2015년까지 발표된 국내 학술지 논문 81편을 대상으로 분석하였다. 연구 결과 연구 시기는 2014년(19편), 2013년(13편), 2009년(11편) 순으로 발표되었고, 연구 대상은 일반학생, 영재학생, 교사, 예비교사 순으로 수행되었으며, 연구 대상 학년은 5학년과 6학년이 가장 많았으며, 4학년, 3학년, 2학년과 1학년 순이었다. 연구 방법은 양적연구, 문헌연구, 질적연구, 혼합연구 순이었고, 연구 내용은 이론 및 내용분석, 프로그램 개발 및 적용, 효과분석, 실태 및 인식 순으로 수행되었고 대체로 비숫한 비율로 연구되고 있었다. 발명교육 접근법은 생활발명중심, 발명제작중심, 문제해결중심, 동화활용 중심 순으로 연구되었으며, 발명교육효과성은 창의성 분야가 가장 많았고, 발명태도와 발명 흥미도 순이었다. 연구 결과를 토대로 추후 연구의 방향성을 논의하고 유아교육에서의 방향을 탐색하여 제시하였다.

현장 기반 중심 아동 안전관리 수업의 의미 탐색: 예비유아교사를 중심으로

이경연 학습자중심교과교육학회 2022 학습자중심교과교육연구 Vol.22 No.17

Objectives This study explored the meaning of a field-based child safety management class for prospective pre-service early childhood teachers. Methods The study period was from July to December 2021, and the participants were 61 prospective pre-service early childhood teachers who took the child safety management class at a two-year college located in S city. The study participants received a field-based child safety management class for 3 hours once a week for 15 weeks, and their reflective journals, class performance improvement evaluation sheets, end-of-semester reflection sheets, and researcher journals were collected and analyzed. Results The results showed that the prospective pre-primary teachers experienced “connecting theory and practice through field data,” “getting ideas for child safety classes through class case analysis,” “becoming a field-oriented teacher by inviting field experts,” and “enhancing child safety class competency through field-oriented class demonstrations.” Conclusions Through these results, it was confirmed that the field-based child safety management class for pre-service early childhood teachers had educational significance. 목적 본 연구는 예비유아교사를 대상으로 한 현장 기반 중심 아동 안전관리 수업의 의미를 분석하고자 했다. 방법 연구기간은 2021년 7월부터 12월까지였으며, 연구 참여자는 S시에 소재한 2년제 대학의 아동 안전관리 강의를 수강하는예비유아교사 61명이었다. 연구참여자를 대상으로 현장 기반 중심 아동 안전관리 수업을 15주 동안 주1회 3시간 진행하였으며, 예비유아교사들의 반성적 저널, 수업 실연 개선 평가지, 학기말 성찰 기록지, 연구자 저널을 수집한 뒤 분석했다. 결과 예비유아교사들은 현장 기반 중심 아동 안전관리 수업을 통해 ‘현장 자료를 통해 이론과 실제 연결하기’, ‘수업 사례 분석을 통해아동 안전수업의 아이디어 얻기’, ‘현장전문가 초빙을 통해 현장 밀착형 교사되기’, ‘현장 탐방 수업을 통해 재난 안전의 중요성 깨닫기’, ‘현장 기반 수업 실연을 통해 아동 안전 수업 역량 강화하기’ 등을 경험하는 것으로 나타났다. 결론 이러한 결과를 통해 예비유아교사를 대상으로 한 현장 기반 중심의 아동 안전관리 수업은 교육적 의미가 있는 것으로 나타났다.

심한 호중구 감소증을 보인 X-관련성 범저감마글로불린혈증 1례

이경연,이동규,박준은,이재호,이명익 대한 소아알레르기 호흡기학회 2002 Allergy Asthma & Respiratory Disease Vol.12 No.4

A Case of X-Linked Agammaglobulinemia Associated withSevere Neutropenia Kyoung Yeon Lee, M.D., Dong Kyu Lee, M.D., Jun Eun Park, M.D.,Jae Ho Lee, M.D.* and Myung Ik Lee, M.D. 저자들은 폐렴치료 중 1개월 이상 심한 호중구 감소증이 지속되었던, 유전자 분석으로 확진된 XLA 환아를 경험하였기에 문헌고찰과 함께 보고하며, 만성 혹은 반복되는 감염의 증상과 함께 호중구 감소증이 나타날 때 XLA를 포함한 면역결핍질환을 의심하는 것이 필요하다고 사료된다.

剔出 白鼠 Vas Deferens에서의 Morphine 效力에 미치는 Naloxone의 影響

이경연,배철,곽용근,최인선,조규박 의과학연구소 1987 全北醫大論文集 Vol.11 No.3

In the present study, experiments were designed to see whether there was a relationship between the development of narcotic tolerance and the qualitative change in opiate receptor in vitro. Studies were conducted in the coaxially stimulated vas deferens isolated from naive or chronically morphine-treated rat. The results were as follows; 1. In naive and chronically morphine-treated groups, the inhibitory action of morphine was decreased by naloxone. 2. The ID_50 of morphine in naive group was 0.39±0.03 μM and the value was increased in chronically morphine-treated group(1.07±0.13μM ). 3. The PA₂ value in naive group was 8.41 and the value was significantly decreased in chronically morphine-treated group(7.60). From the above results, it is suggested that the decrease in inhibitory action of morphine by chronic morphine treatment is closely related to affinity changes in opiate receptor.