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.

무증상군의 요추부 유연성과 그라프 불안정 정도

강재도,김광열,김형천,정경칠,유호섭 침례병원 1998 浸禮病院學術誌 Vol.14 No.-

구멍연잎성게, Astriclypeus manni (VERRIL1867) 의 먹이섭취, 서식밀도 및 이동속도에 관하여

강도형,최광식 한국환경생물학회 2002 환경생물 : 환경생물학회지 Vol.20 No.2

부정형성게류인 구멍연잎성게는 제주도 연안에 널리 분포하고 있음에도 불구하고 생태학적 연구들이 미비한 실정이다. 이 연구는 구멍연잎성게의 행동학적 연구로서 먹이섭취, 서식밀도 및 이동에 대한 기초자료로서 시료는 제주도의 북동쪽에 위치한 함덕에서 SCUBA를 통하여 채집 및 현장에서 직접 관찰하였다. 장내용물 관찰 결과, 장내 퇴적물 입자의 평균 입도조성은 77.6±22.2 μm였다. 장 내용물은 유공충, 저서성 요각류, 선충류, 규조류, 알, 해조류의 파편, 골편 등의 동식물 플랑크톤으로 구성되었다. 구멍연잎성게의 서식밀도는 1m^2당 0.4개체이며, 분포패턴은 임의분포(random distribution)에 기초하는 것으로 판단되었다(X^2=85.16, P>0.05). 구멍연잎성게의 이동거리는 여름철인 1998년 8월에 6.2∼64.8 cm hr^-1 (mean = 25.0±13.9)이었고, 5월에는 2.O~43.Ocm hr^-1(mean=17.7±10.7)로 8월에 다소 높게 나타났다. 여름기간 중 관찰된 비교적 빠른 이동속도는 먹이 섭이 활동과 관련된 것으로 추정되었다. Sand dollar, Astriclypeus manni (Echinodermata: Echinoidea) is widely distributed on subtidal sand flats all along the coast of Cheju Island. Limited information has been reported on their ecology despite their abundance. This study reports gut contents, density and locomotion of the sand dollars distributed on a subtidal sand flat on the north-east coast of Cheju Island. Microscopic examination of the gut contents indicated that A. manni feeds on inorganic and organic detritus as well as live organisms contained in the sediments. Inorganic particles included sand grains, sponge spicules and shells of benthic animals such as foraminifera, crustacean and molluscs. Mean diameter of sediment particles retained in the gut was 77.6±22.2㎛. Live organisms retained in the gut included foraminifera, harpacticoid copepods, nematodes, diatoms and unidentified egg. Spatial distribution pattern of the sand dollar was found to be random with a mean density of 0.4 individual m^-2(??^2=85.16, p>0.05). Locomotion speed of the sand dollar measured in situ was 2.0 to 65.0 ㎝ hr^-1. Locomotion speed and moving distance was somewhat higher in summer when food availability also higher.

폐암세포에 대한 附子 추출물의 독성 효과

권강범,김은경,문형철,송용선,류도곤 한국전통의학연구소 2006 한국전통의학지 Vol.15 No.1

The aim of this study was to investigate the cytotoxic effect and its mechanism on Radix Aconiti(RA) extract in lung cancer cell lines. RA extract treatment decreased the cell viability in a dose-dependent fashions in lung cancer cells including A549, H460, H23 and H157 cells. Many investigators reported that A549 and H460 cells expressed wild-type p53, but H23 and H157 cells preserved mutated p53. After treatment with RA extract in A549 and H460 cells, we measured the expression of p53 protein levels using Western blot, analysis. In both cells treated with RA extracts, p53 protein expressions were increased in a dose-dependent manner. In our experiments, RA extracts also have cytotoxic effects in H23 and H157, which have mutated p53. Treatment with RA extract decreased bcl-2 protein expressions in both cells. These results suggest that RA extracts have cytotoxic effects via p53 expression increase and bcl-2 inhibitable pathways in A549, H460 cells and H23, H157 cells, respectively.

월출산국립공원 수질특성에 관한 연구

최형일,김난희,강영주,채희정,김연풍,조도호,설동화 조선대학교 환경공해연구소 2007 環境公害硏究 Vol.20 No.1

Because mountain streams have narrow widths and steep slopes compared to streams and lakes, hours of immobility are considerably short, and the quality of mountain streams has been greatly influenced by rainfall, land-use, components of the streambed and types of forests. During the summer when heavy rainfall occurs, eroded earth and sand flow into mountain streams and cause temporarily high turbidity. It is also the cause of eutrophication, which is frequently found in downstream. As evaluation standards for the quality of mountain streams were not established in Korea, this quality was evaluated by examining some items based on quality standards for drinkable water and research on the influences of pollution in mountain streams, which showed that these were seldom in downstream water systems. Mountain streams within Wolchulsan National Park flow into a reservoir and when characteristics of mountain streams from forests and rainfall that flow into mountain streams through forest ecosystems were studied, results of measuring its changes are as follows. Monthly changes of pH were low between April and August and higher starting October, and the EC was measured higher in the winter and the spring and tended to be low starting April. The EC on the 19th of May and the 23rd of October and the concentration of floating materials and COD_(Mn) were observed to be higher due to the influence of rainfall on the 19th of May and the 22nd of October, and it was judged that the washing out of dried deposits attached to the water pipe and the leaching of woods were influenced by rainfall. It is considered that real-time monitoring of water quality for a long time and water quality conditions during and after rainfall should be examined for ensuring basic data of water quality and evaluating characteristics and seasonableness of mountain streams, which may be greatly changed by artificial influence in the future.

담양신설 IC의 교통소음도 조사연구

최형일,강영주,채희정,김연풍,조도호,설동화,정숙경 조선대학교 환경공해연구소 2007 環境公害硏究 Vol.20 No.1

After the vehicle has become a large formation with high-speed, loud noise from an express highway is increasing, and the number of large-scale apartment complexes, which are recently being constructed in the metropolitan area nearby the express highway and IC, is increasing gradually. Compared with a main road, the traffic volume and the speed of a vehicle between IC and the ramp way [turn-off] are smaller. If the ramp way is rightly connected with the downtown area, however, the traffic-noise that comes about in surrounding areas will be in conjunction with the traffic-noise from the main road of express highway and that of the ramp way. This research has selected a place that hasn't had a road or a commercial quarter nearby the main-road of IC and ramp way. Then we have studied the traffic-noise status under minimizing influence of its outer-noise, which occurs in IC. 1. The traffic volume change of a small and full-sized car with time has been kept on regularity in 2004 and 2005. As the traffic volume of a full-sized car has diminished remarkably, it has been maintaining through 6:00a.m.-10:00 a.m. As it has decreased since lO:OO a.m.. we have also observed the traffic proportion going up. 2. Monthly traffic volume of small cars was higher in May, August and October than other months. We have observed that the high traffic volume during these months is due to the following: May-The Damyang festival, August-a high-demand season, October-viewing scarlet maple leaves. Monthly traffic volume of full-sized cars was generally higher in August, but it has decreased during 2006. This was due to the many construction trucks that were working on the extension of the 88 Olympic expressway. Therefore, there was more traffic volume in 2006 compared to 2004 and 2005. 3. In this study, the noise figures have been less than 55 dB(A) in 18 spots. There were 14 spots from 55dB(A) to 58dB(A). 58-61dB(A) : 20, 61-64dB(A) : 17, 64-67dB(A) : 18. There were 8 spots we observed at the highest level from 67dB(A) to 70dB(A). Those were the nearby spots separating the main road and Damyang IC. 4. Traffic-noise at the boundary between IC and the main road of an expressway was higher than that of the same distance in other places. 5. We have observed that traffic-noise is low in places with mountains that serve the role of soundproofing walls. Thus, the fundamental sound hadn't affected it.

양자교환 방식에 의한 방향성 결합기의 제작 및 특성연구

소대화,채기병,강기성,윤형도 明知大學校 産業技術硏究所 1992 産業技術硏究所論文集 Vol.11 No.-

In this study, a directional coupler which is fabricated on X-cut LiNbO₃ substrate by using proton exchange method is described. It is found that the directional coupler waveguide varied widely with controlling diffusion process. On the other hand, the on-off state of modulator is performed by annealing process and self-aligned electrodes are used in fabricating the direction coupler. As a results, the direction coupler has good characteristics : the measured on-off switching voltage of about 2.7-3V.

정신분열병의 임상적 고위험군의 특징 : '서울청년클리닉'의 자연 추적 관찰 예비연구

유소영,이경진,강도형,이승재,하태현,위휘,이애라,송지연,김성년,권준수 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.1

Objectives : The aims of this study were to identify the intake and following process for subjects at high risk of transition to schizophrenia and to examine the neurocognitive, social, and emotional functions of the subjects compared with healthy controls. Methods : Symptomatic individuals judged at high risk for schizophrenia ('clinical high risk') within Youth Clinic were assessed and followed up. They performed a neurocognitive function test, a social function test and an affective function test. Twenty healthy controls were recruited in this study. Results : Among eighty-two subjects contacted through the Youth clinic, sixteen subjects were judged as the clinical high risk group. Fourteen subjects among the clinical high risk group showed deficits in several domains of neurocognitive functions, such as visual recall memory, verbal short term memory and executive function. Social and affective functions are also impaired in the Cli-nical high risk group compared with healthy controls. Two of 15 subjects (13%) developed a psychotic disorder within 6 months. Conclusion : This study illustrates the state of follow-up study for a clinical high risk group. Despite low numbers and short durations, some impairment of several functions in the clinical high risk group suggests possible predictors of psychosis.

청소년 정신과 환자 중 외톨이 혹은 왕따 특성을 보이는 환자에 대한 예비 연구

손정우,김은정,홍성도,이시형,홍강의 대한소아청소년정신의학회 2000 소아청소년정신의학 Vol.11 No.2

본 연구는 청소년 정신과 환자 중 외톨이 혹은 왕따 특성을 보이는 환자에 대한 예비연구이다. 청소년 정신과 환자 25명에게 외톨이 설문지, 왕따 설문지 등 8개 설문지를 시행하였고, 일반적인 친구 관계를 질문하였다. 외톨이 설문지 및 왕따 설문지의 점수를 근거로 15명의 외톨이-왕따 집단과 10명의 비외톨이 집단으로 나눈 뒤 일반적 친구 관계와 8개 설문지의 점수를 비교하였다. 또한 5명의 외톨이-왕따 환자 사례를 분석하였다. 이때 SCL-90-R의 우울 차원 점수, 불안 차원 점수, 편집 차원 점수, SCL-90-R의 4가지 차원의 총합, 사회 불안 설문지 점수 등에서 두 집단이 유의한 차이를 보였다. 5명의 외톨이-왕따 환자의 사례 분석 결과, 병원을 찾은 청소년 정신과 환자는 언어 발달 및 인지 발달의 지연 등 발달에서의 문제가 동반되는 경우에 외톨이-왕따를 당할 가능성이 높은 경향을 보인다. 중심 단어 : 외톨이ㆍ왕따ㆍ청소년ㆍ발달. This study was a preliminary study on the adolescent psychiatric patients that show the characteristics of peer group neglect or rejection. We divided the adolescent psychiatric patients (n=25) into neglect-reject group(n=15) and non-neglect group(n= 10). Each patient answered 8 scales and several questions about general relationships with friends. And, both the score of each 8 scales and answer about qusetions were examined. Lastly, records of 5 cases from neglect-reject group were analyzed. The depression dimension score of SCL-90-R, anxiety dimension score of SCL-90-R, paranoid dimension score of SCL-90-R, interaction anxiousness scale(IAS) score were significantly different between 2 groups. On the result of case analysis about 5 patients of neglect-reject group, the adolescent psychiatric patients had a tendency to be rejected or neglected in case of having developmental problems(for example, language development or cognitive impairment). KEY WORDS : Peer neglectㆍPeer rejectionㆍAdolescentㆍDevelopment.

한국에서 메스암페타민 남용 또는 의존 환자의 인격장애에 관한 연구

김소영,권성민,조성남,권도훈,강병조,김형태 대한생물치료정신의학회 2003 생물치료정신의학 Vol.9 No.2

연구 목적 : 메스암페타민 남용 또는 의존이 없는 군과 있는 군 사이의 인격장애의 유병율을 알아보고, 메스암페타민 남용 또는 의존군에서 동반 인격장애가 그들의 전반적 기능 및 일반적 특성에 어떠한 영향을 미치는지 알아보고자 하였다. 방 법 : 대상은 정상대조군에서 메스암페타민 남용 또는 의존이 없는 50명과 정신병원에 입원한 메스암페타민 남용 또는 의존환자 50명이었다. 메스암페타민 남용과 전반적 기능에 대한 평가는 DSM-Ⅳ에 의거하였고, 인격장애를 평가하기 위해 대상군 모두에서 PDQ-4+를 시행하였다. 결 과 : 정상대조군은 34%에서 적어도 1개 이상의 인격장애를 나타내었으며, 한 사람 당 평균 3.94개였다. 메스암페타민 남용 또는 의존군은 64%에서 적어도 1개 이상의 인격장애를 보였으며, 한 환자 당 평균 4.72개였다. 메스암페타민 남용 또는 의존군에서 동반 인격장애의 유무는 시작 연령, 사용 용량, 그리고 입원 또는 구치 횟수와는 관련성이 없는 것으로 나타났으나, 3개 이상의 동반 인격장애를 가질 경우, 그렇지 않은 군에 비해 전반적 기능이 떨어졌다. 결 론 : 본 연구 결과, 우리나라에서도 일반인에 비해 물질사용장애 환자에서 인격장애를 동반할 가능성이 높으며, 물질사용장애 환자 중에서도 인격장애를 동반한 군이 그렇지 않은 군에 비해 전반적으로 기능이 떨어진다는 결론이 가능하게 되었다. Objectives : The purpose of this study was to examine the prevalence of personality disorders between normal control group and hospitalized methamphetamine abuse or dependent patients and, among the latter, the influence of comorbid personality disorder on their global assesment function and general characteristics. Methods : Subjects were 50 non-methamphetamine abuse or dependent persons in the general population group and 50 methamphetamine abuse or dependent patients admitted to the psychiatric hospital. Methamphetamine abuse or dependence and the global assesment function were diagnosed according to DSM-Ⅳ, and the presence of personality disorder was assessed with the PDQ-4+. Results : In the normal control group, 34% of subjects had at least one personality disorder and the average number of personality disorder was 3.94 per person. In the methamphetamine abuse or dependent group, 64% of the patients had at least one personality disorder and the average number .of personality disorder was 4.72 per patient. The presence of comorbid personality disorder were not associated with onset age, use dosage and the number of admission or arrest among the methamphetamine abuse or dependent group. But, when methamphetamine abuse or dependent patients had more than three personality disorders, the global assessment function was impaired. Conclusion : In our study, substance use disorder patients had the higher possibility of comorbid personality disorder in Korea, and among substance use disorder patients, those with comorbid personality disorders were associated with the greater global impairment.