소형민수헬기 능동진동제어시스템 개발

김남조(Nam-Jo Kim),곽동일(Dong-Il Kwak),강우람(Woo-Ram Kang),황유상(Yoo-Sang Hwang),김도형(Do-Hyung Kim),김찬동(Chan-Dong Kim),이기진(Ki-Jin Lee),소희섭(Hee-Soup So) 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.3

헬기의 능동진동제어시스템(AVCS)은 주로터로부터 발생되는 진동을 제어하며, 수동형 진동저감장치 대비 저중량으로 우수한 진동저감 성능을 발휘한다. 본 논문에서는 FxLMS 알고리즘을 기반으로 타코미터 및 가속도 센서 신호를 통해 연산된 제어명령을 하중발생기(CFG)로 전달하여 소형 민수헬기의 진동을 제어하는 소프트웨어 개발 및 검증 내용을 제시하였다. DO-178C /DO-331 표준에 따라 모델 기반 설계 기법을 통해 진동제어 소프트웨어를 개발하였으며, PILS 및 HILS 환경에서 실시간 작동 성능을 평가하였다. 특히, PILS 환경에서는 LDRA 기반 검증 커버리지를 통해 소프트웨어의 신뢰성을 향상시켰다. AVCS를 소형민수헬기에 적용하기 위해 지상/비행시험을 통해 대상 헬기 동적응답특성 모델을 획득하였다. 이를 기반으로 시스템 최적화 분석 및 비행시험을 통해 최적 성능을 발휘하는 AVCS 형상을 결정하고, STC 인증을 획득하였다. Active vibration control system(AVCS) for helicopter enables to control the vibration generated from the main rotor and has the superb vibration reduction performance with low weight compared passive vibration reduction device. In this paper, FxLMS algorithm-based vibration control software of the light civil helicopter tansmits the control command calculated using the signals of the tachometer and accelerometers to the circular force generator(CFG) is developed and verified. According to the RTCA DO-178C/DO-331, the vibration control software is developed through the model based design technique, and real-time operation performance is evaluated in PILS(processor in-the loop simulation) and HILS(hardware in-the loop simulation) environments. In particular, the reliability of the software is improved through the LDRA-based verification coverage in the PIL environments. In order to AVCS to light civil helicopter(LCH), the dynamic response characteristic model is obtained through the ground/flight tests. AVCS configuration which exhibits the optimal performance is determined using system optimization analysis and flight test and obtain STC certification.

圓周狀슬라이스의 오-븐건조법에 의한 함수율의 圓盤내 방사방향분포 추이 평가 (Ⅱ) : 주요 국산 침엽수재를 중심으로 For some of domestic softwoods

이남호,Li, Chengyuan,최준호,황의도,진영문 한국목재공학회 2004 목재공학 Vol.32 No.2

본 연구는 주요 국산 침엽수재 원반에서 채취한 두께 3 ㎜의 圓周狀슬라이스를 오-븐에서 급속 건조하면서 각 원반내 함수율의 방사방향 분포추이를 조사하기 위하여 수행하였다. 소나무의 경우 건조가 진행됨에 따라 변재부는 매우 급속한 건조속도로 함수율이 감소한 반면, 심재부는 건조속도가 느려 오히려 생재함수율이 높은 변재부가 심재부보다 먼저 섬유포화점에 도달하였으나, 이러한 분포상태가 장시간 지속되지는 않았다. 낙엽송의 경우 변재부의 생재함수율이 심재부보다 약 3배 가량 높은 분포를 보였으며, 이러한 수분경사 패턴은 평균함수율 약 20%일때 까지 지속되었다. 은행나무의 경우 변재영역 내에서는 매우 고른 생재함수율 분포를 보였으며, 건조가 진행되면서도 어느 정도의 진폭은 존재하였지만 비교적 균일한 함수율 분포를 보였다. 삼나무의 경우 심재부는 생재함수율이 매우 낮아 건조 초기부터 수축이 개시되지만 높은 함수율을 나타내고 있는 변재부에 의해 수축이 억제되므로써 심재영역 또는 이행재 영역에 인장응력이 형성될 것으로 판단된다. 편백나무 변재의 생재함수율은 심재보다 훨씬 낮아 침엽수재의 일반적인 함수율 분포와는 정반대의 분포를 나타내었으며, 이러한 함수율 분포패턴은 평균함수율 약 21%까지도 지속되었다. 측백나무의 경우 변재부의 생재함수율이 심재부보다 약 2배 정도 더 높은 분포를 보였으나, 건조가 진행되면서 이러한 분포는 빠른 속도로 약화되었다. This study was carried out to investigate a radial distribution of moisture contents (MCs) within a log cross section (LC) during ovendrying of 3 mm-thick circumferential slices cut from several domestic softwoods LCs. For Korean red pine, drying rate of sapwood slices during oven-drying represented much higher values than that of heartwood slices, and so sapwood with higher green MC early reached below fiber saturation point (FSP) rather than heartwood did. However, this distribution of moistures did not last for long duration. For Japanese larch, green MC of sapwood was approximately three times higher than that of heartwood. This similar distribution in MC was lasted until about 20% average MC. The MC was around uniform throughout the sapwood of Ginkgo when green and during oven-drying, although it was somewhat fluctuated. For Japanese cedar, the heartwood with so low moistures around FSP would begin to shrink from the beginning stage of drying, but the sapwood above hygroscopic MC prevents the heartwood from shrinking, and consequently, the heartwood or the transition wood goes into tension stress. The results for Japanese cypress showed that the green MCs of the sapwoods were much lower than those for heartwoods, and then this trend was continued until about 20% in average MC. For Chinese thuja, the green MCs of sapwoods were about 2 times as high as those of heartwood, hut this along the radial gradient in MC rapidly hecame gentle during oven-drying.

Jazz Dance 참여를 통한 여가만족도 효과 측정

배남은,김종혁,김도진 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4

This study is to evaluate effect's difference of Leisure Satisfaction Scale for Jazz Dance Attendance. It researched effectively for Jazz Dance Attendance and motive, It also offer a fundamental information of study related with Jazz Dance, This study processed a subject of middle aged woman who attended Jazz dance at Life Education Organization and Society Education Organization in Kyunggi-do S and A city during periodic time, The measurement implement is used the Ragheb & Beard's Leisure Satisfaction Scale. It used a demographic factors and attended feature factors 4 questionnaire, a psychological satisfaction factor 4 questionnaire, a physical satisfaction factors 4 questionnaire, an environmental satisfaction factors 3 questionnaire, an educational satisfaction factors 4 questionnaire, The confidence level is showed .79 ~.83. Data information analyze using SPSS version 11.0, It produced the M, SD for acquiring feature of responsor and fundamental data of study object, It used reliability analysis for acquiring Cronbach' a of research questionnaire, Also it is used one-way ANOVA and independent T-Test for difference verification between the group according to each variables. Suppose it has a significant difference, for using I Multiple comparison method, according to this step is the following results; First of all. It was showed a significant difference of a psychological and educational satisfaction factors by age 50. Second, It was showed a significant difference or a psychological and environmental satisfaction factors at an effect's difference of Leisure Satisfaction Scale by academic education lower high school. Third, it was showed a significant difference of a psychological, environmental, and educational satisfaction factors at an effect's difference of Leisure Satisfaction Scale by salary. Forth, it was not showed a significant difference of each factors at an effect's difference of Leisure Satisfaction Scale by attended time.

해안대수층 지하수흐름의 특성 : 실내 실험연구 LABORATORY EXPERIMENTS

박남식,김진후,나겐드라 쿠마,홍성훈,김현도 東亞大學校建設技術硏究所 2004 硏究論文集 Vol.28 No.1

Experiments were conducted using laboratory models to study salt water intrusion phenomena in coastal aquifers. Two models filled with sand were used. The smaller model could produce steady-state cross-sectional flow in a reasonably short time. The bigger model produced a more interesting three-dimensional flow field compare to the smaller one, but it also took much more time to reach steady states and posed difficulties in observing results. A cross-sectional model was used to investigate 'freshwater lens'phenomena. A few pumping scenarios were tested. Contamination of the well with excessive withdrawal was observed. The effectiveness of a scavenger well was studied. The bigger model was used to study the steady-state lateral intrusion problems. Various attempts were made to measure the interface position in the sand.

캡슐내시경과 단일풍선 소장내시경으로 진단된 공장의 간질종양 1예

송도경,심기남,태정현,김경진,송명은,송하응,윤혜원,정가영,정정화 이화여자대학교 의과학연구소 2012 EMJ (Ewha medical journal) Vol.35 No.2

Gastrointestinal stromal tumors (GISTs) are common mesenchymal tumors that arise in the wall of the gastrointestinal tract. We report a case of obscure gastrointestinal bleeding due to a GIST of the jejunum successfully documented by videocapsule endoscopy (VCE) and single-balloon enteroscopy (SBE). A 36-year-old man with hematochezia was referred for further evaluation of no evidence of bleeding focus on esophagogastroduodenoscopy and colonoscopy. A VCE showed a suspicious ulcerative hyperemic mass that located in about 1 hour apart from duodenal second portion. SBE revealed a nonbleeding 4×2 cm mass with an ulcer at the proximal jejunum. The patient underwent laparoscopic resection without complication. Histological examination revealed a well circumscribed, dumbbell-shaped firm mass comprised of spindle cells. Immunohistochemical staining for CD 117 was diffusely positive, whereas staining for S-100, CD 34 and MIB-1 was all negative. It was confirmed to be a low-grade GIST at the proximal jejunum.

우리나라 일부 석면사업장의 석면폐 유병률

백도명,백남원,최정근,손미아,임정기,이원진,문영한,박정선,최병순 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.1

Asbestos industry has been in operation over 60 years in Korea. However, the prevalence of asbestosis has not been yet reported. With rapid turn-over of workers, previous cross-sectional studies of current workers on the job could not find cases with exposures long enough for the development of asbestosis. This study was done to evaluate asbestosis prevalence of those worksites with operation history of more than 20 years. In total, 139 workers from 5 worksites were examined. Asbestos industries covered in the study include 2 asbestos textile, 1 brake lining, and 2 ship repairing worksites. Chest x-ray was taken from all workers and read by two experts familiar with pneumoconiosis classification according to 1980 ILO guidelines. Those with findings compatible with asbestosis were further ckecked with high resolution computerized tomography (HRCT). Pulmonary function tests were done according to ATS guidelines, and occupational and previous medical history was taken through a standardized interview. Air-borne asbestos was measured according to NIOSH method 7400. The air-borne asbestos concentrations ranged from 0.2-1.3 f/cc for asbestos textile, from 0.7-1.0 f/cc for brake lining, and from 6.3-7.8 f/cc during asbestos removal at ship repairing worksite. Of the 139 workers 25 had abnormal chest radiographic findings, and 10 of them had findings compatible with pneumoconiosis. When work history and current asbestos measurements were accounted, 9 workers who had more than 10 years of asbestos exposure history showed chest radiographic findings of pneumoconiosis with Finally, 4 workers showed finding of pulmonary fibrosis and/or pleural thickening at HRCT, and 2 of them had restrictive lung function changes. The study results showed that, among 139 subjects, there were 4(3%) definite asbestosis cases confirmed with HRCT. The prevalence of probable asbestosis was 7% for 10-14 years of exposure, 13% for 15-19 years of exposure, and 23% for 20 or more years of exposure. The prevalence of compensable asbestosis with abnormal lung function was 4-6% for those with 15 or more years of exposure.

스팸메일 포착을 위한 데이터마이닝 기법 비교

김동건,조진남,장도석 同德女子大學校 情報科學硏究所 2004 정보과학연구 Vol.8 No.-

스팸메일로 인한 사회적 손실이 급증하고 있는 가운데 스팸메일을 포착하는 각종 방법들이 개발되고 있다. 본 연구에서는 스팸메일엔진에 사용 가능한 데이터마이닝기법을 단일기법과 혼합기법으로 나누어 Spambase데이터에 적용하였다. 적용 결과, 가장 많이 쓰이고 있는 Naive Bayes기법의 성능이 가장 저조하였던 반면, SVM과 복합기법의 성능이 탁월한 것으로 나타났다. This study compares recently developed data mining algorithms for detecting spam mails. We have considered single classifiers, such as Naive Bayes classifier, LDA, QDA, logistic discriminant, and support vector machines and ensemble methods such as Bagging and Random Forest. While SVM and ensemble methods show excellent performance, Naive Bayes classifier which has been popular in detecting spam mails shows low performance.

Regioselective Enzymatic Acylation of Multi-hydroxyl Compounds in Organic Synthesis

Park, Hyun-Gyu,Do, Jin-Hwan,Chang, Ho-Nam The Korean Society for Biotechnology and Bioengine 2003 Biotechnology and Bioprocess Engineering Vol.8 No.1

With current developments in enzyme-catalyzed reactions and techniques available for rational redesign of natural biocatalysts, the enzymatic biosynthesis can become one of the most valuable Synthetic methods. Enzymatic regioselective catalysis in organic media has played a key role in pursuing asymmetric synthesis for active chiral compounds. Here, we shortly do-scribe some historical issues of the rapidly growing area, enzymatic catalysis in synthetic organic chemistry and then review researches that have been carried out in the regioselective enzymatic catalysis for the past two decades. An application of this technology to the modification of some potential target drug co m pound will be adios presented.

私立大學生의 成長發育 및 營養狀態에 關한 硏究 : 中學校 入試有無過程을 通한 比較

朴淳永,具燾書,朴良元,金振浩,南炳執,朴昌植,朴喆斌 慶熙大學校 1980 論文集 Vol.10 No.-

In order to ascertain any possible changes in the physical and the nutritional status of Korean high school students before and after the abolishment of college entrance examination system, an intensive survey was conducted on the physical conditions of the incoming freshmen students (9532 males and 3428 females) of Kyung Hee University from 1972 to 1980. The finding are as below. 1. Physical growth conditions In each of the average physical dimensions of body height, body weight, chest girth and sitting height, a remarkable improvement was recorded for all age groups after the matriculation was abolished. 2. Physical and nutritional indices Relative body weight showed constant values of 35.0 in male and 32.0 in female. Relative chest girth showed the normal chest girth style in all age groups of both sexes. Relative sitting height showed a constant value of 54 for both sexes. The values of vervaeck index of th nutritional status were shown to be between 86-87 in male and 83-94 in female, Pelidisi index 91 and 92-93, Rohrer index of physical status 121-125 and 130-132, and Kaup index 206-211 and 202-210, respectively.

양극성 장애 조증과 혼재성 삽화의 치료제로서 Topiramate 단독요법의 항조증 효과와 안정성에 대한 예비 연구

천봉희,권성민,장진열,조성남,조 웅,권도훈 대한생물치료정신의학회 2002 생물치료정신의학 Vol.8 No.2

저자들은 양국성 장애 조중삽화 및 혼재성 삽화의 단독 치료제로서 새로운 항경련제인 topiramate의 항조증 효과와 안정성을 평가하기 위하여 본 연구를 하였다. 양극성 장애 조증 삽화와 혼재성 삽화로 진단이되어 입원을 한 환자 14명(남자 6명, 여자 8명)을 대상으로 topiramate를 단독으로 6주간 투여하였다. Young's Manic Rating Scale(YMRS), Brief Psychotic Rating Scale(BPRS)로 환자들의 증상정도를 평가하였으며, 추가해서 체중변화도 측정하였다. 연구결과, YMRS, BPRS 평균점수 및 체중은 topiramate 치료 전에 비해 6주 치료 후에 유의하게 감소되었다. 또, YMRS 점수가 20미만일 때 조증상태가 안정된 것으로 본다면, 본 연구에서 치료 6주 후 YMRS 점수가 20미만인 환자는 14명 중 7명으로 topiramate의 치료 반응률은 50%라 할 수 있다. 가장 흔한 부작용은 위장관 증상으로서 식욕감퇴, 구역, 설사 등이었으며, 이는 6주 연구 후에 topiramate 치료를 중단하게 하는 원인이었다. 진전이나 이상감각은 대체로 topiramate를 투여한 후 1∼2주 내에 나타났다가 1∼2주 지속된 후 사라졌다. 향후 연구에서는 본 연구의 제한점을 보완하는 대조군 연구가 필요하며, 부작용을 줄이기 위한 보다 적절한 topiramate의 증량방법도 고안되어야만 할 것이다. Objectives : Topiramate is a newly developed anticonvulsant agent with possible mood-stabilizing properties. The purpose of this study is to explore the antimanic efficacy and the tolerability of topiramate as monotherapy in bipolarⅠdisorder, most recent episode manic or mixed. Method : In this study, fourteen hospitalozed patients who met the DSM-Ⅳ criteria for bipolarⅠdisorder, most recent episode manic or mixed were given topiramate monotherapy for up to 6 weeks. The response to topiramate was assessed with Young's Manic Rating Scale(YMRS) and Brief Psychotic Rating Scale(BPRS). Body weight changes were also measured. The Ratings were completed at baseline nad then on 1,2,3,4, and 6 weeks. Results : The mean Young's Manic Rating Scale(YMRS) score improved from 38.36(25-42) at baseline to 22.29(12-37) at the end of the study. The Brief Psychotic Rating Scale(BPRS) score improved from baseline mean of 44.64(35-60) to a last observation of 28.92(13-43). The mean body weight decreased from 62.43kg(47-81kg) to 58.64kg(45-81kg). At the end of study, seven patients scored less than 20 on the YMRS score, three of them were less than 13, Adverse events included anorexia(N=9), nausea(N=6), diarrhea(N=4), paresthesia(N=4), tremor(N=2), and rash(N=1). Conclusion : In this study, the response rate to topiramate was 50% as a treatment agent for bipolarⅠdisorder, most recent episode manic or mixed and topiramate might be associated with weight loss. But the adverse effects such as gastrointestinal sympotoms decreased the compliance of topiramate. Inthe future, double-blind controlled studies are needed to further investigate the antimanic efficacy and tolerability of topiramate.