적응 등화기에서 데이터-재사용 LMS 알고리즘을 이용한 신호 간섭 제어

김원균,김동국,곽종서,나상동 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.2

적응 등화기에서 LMS 알고리즘의 수렴 속도를 개선하기 위한 데이터 재순환 버퍼 구조를 제안한다. 폐기된 수신 데이터를 재활용함으로서 심볼 시간 주기에 적응 등화기의 에러를 이용한 가중치 갱신을 통해 제안된 알고리즘의 수렴특성을 분석하여 수렴 속도가 향상됨을 보인다. 컴퓨터 시뮬레이션 결과를 통해 스텝-크기 매개변수 μ가 증가됨에 따라 알고리즘의 수렴 속도가 상응하게 감소하고 또한, 스텝 크기 매개변수 μ의 증가는 실험적으로 계산된 학습 곡선에서 평균 자승 에러를 감소시키는 효과를 갖는다. 고유치 확산을 감소시킴에 따라 적응 등화기의 수렴속도를 천천히 감소시키고 평균 자승 에러의 안정-상태 값을 증가시키는 효과를 나타낸다. 따라서, 제안된 데이터 재순환 버퍼를 이용한 LMS 알고리즘의 수렴 특성을 개선시키고 계산의 복잡도를 증가시키지 않으면서 수렴속도를 (B+1)배만큼 증가시킨다는 것을 보인다. 컴퓨터 시뮬레이션 결과는 최악의 스텝 크기 매개변수와 고유치 확산 영역에 따른 평균 자승 에러를 분석하고 필터 알고리즘에서 신호간섭제어가 우수함을 입증한다. Data-recycling buffer structure to improve the convergence speed of LMS algorithm in adaptive equalizer is proposed. The improvement of convergence speed is shown by analyzing convergence characteristics of the proposed algorithm through updating weight using the error of adaptive equalizer when coefficients are multiply adapted in a symbol time period. As the step-size parameter μ is increased, the rate of convergence of the algorithm is correspondingly decreased through computer simulation result. Also, increasing the step-size parameter μ has the effect of reducing the variation in the experimentally computed learning curve. Reducing the eigenvalue spread has the effect of slowing down the rate of convergence of the adaptive equalizer and also increasing the steady-state value of the average squared error. Accordingly, the analysis shows that convergence speed can increase by (B+1) times, where B is the number of recycled data, as improving of convergence characteristics using the data-recycling buffer and not increasing complex of computation. The results of the computer simulation demonstrate analyzing mean squared error in accordance with the worst step-size parameter and eigenvalue spread and the superiority of signal interference control in the filter algorithm.

청소년의 스포츠 활동 참가와 스트레스의 관계

이종경,서동균 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The purpose of this research is to examine how the adolescents participation in sports influences the stress of them, to back up empirically the fact that such mutual relation have an effect on the daily removal and easing of the stress, and further, being based upon this, to present the basic data required for the policies related to the adolescents. Among these, excluding those questionnaires which were judged to lack the reliability, the number of the samples used actually for the analyses was total 427 students including the 237 participating students and 190 nonparticipating students in the sports activities. The tool for the data collection is the "Survey questionnaire regarding the relations batween the sports participation of the adolescents and stress". and as a result of the adolescents of the reliability the stress α = .80 where high coefficients of the reliability have been derived. For the data analysis the SPSS (Statistical Package for Social Science) program has been used in this research, to meet the purpose of this research the frequency analysis, analysis of covariance, multiple regression analysis have been carried out, and the following research results have been derived. First, experience of participation in sports activities influences on stress level of the adolescents. Namely, the participants of sports activities are more low than the non-participants in stress level. Second, degree of participation in the sports activities influence on stress level of the adolescents, Namely, the participation frequencies have negative influence on stress level.

천연항균성 물질을 이용한 Vibrio vulnificus의 살균 및 독소생성 억제효과

조성환,서일원,최종덕,전상수,라택균,정수근,강동훈 國立統營水産專門大學 附設 水産科學硏究所 1993 수산과학연구소보고 Vol.4 No.-

생선회용 해산물에 오염되어, 생식한 경우 발생되는 패혈병의 원인균주인 Vibrio vulnificus의 생육 및 독성생성을 억제할 목적으로 천연 항균제인 Grapefruit종자추출물(GPSE)을 이용하여 그 항균효과를 검토하였다. In vitro 시험결과, Vibrio vulnificus에 대한 GFSE의 생육최소저해농도는 50~100 ppm 정도이었으며, Vibrio vulnificus 균체세포틀 100 ppm 농도의 GFSE 용액으로 처리하고 전자현미경 촬영시료로 조제하여 촬영한 후, 미생물형태을 무처리대조구와 비교, 검토한 결과, GFSE 처리로 세포막 기능이 파괴되어 세포내용물이 균체외부로 유출되어 균체의 생육이 억제되고 균체내부가 빈 ghost 형태의 균체수가 증대되어 GFSE의 항균효과를 확인할 수 있었다. 한편, 생선회용 해산물에 GFSE를 근육주사하고 Vibrio vulnificus를 접종한 수조내에서 사육하여 채취한 어육부를 마쇄하여 일정량씩을 표준사료에 첨가해서 통닭용 병아리를 실험동물로 하여 사양실험을 실시한 결과. 체중증가율, 단백질이용효율, 혈청내 효소활성, 혈청의 주요성분함량 등에 있어서, GFSE 처리수조내에서 사육한 해산물을 첨가한 시료시험구의 경우, 무첨가사료처리구와 비교할 때 뚜렷한 차이를 목격할 수 없었으며, GFSE 첨가에 따른 실험동물의 성장저해 또는 독성현상을 유발하지 않음을 알 수 있었다. 아울러, 각 처리구에서 사양한 해산물의 어육부에 오염된 Vibrio vulnificus의 균수를 측정한 결과, 250ppm 이상의 GFSE 처리구에서는 Vibrio vulnificus를 전혀 검출할 수 없었다. To prevent food-poisoning outbreaks by Vibrio vulnificus the antimicrobial efficacy of grapefruit seed extract (GFSE) was examined. Minimal inhibitory concentration (in vitro) for the microorganism was found to be 50~100 ppm. Transmission electron micrographs of Vibrio vulnificus showed the biocidal action of this natural antimicrobial agent would be related to specific respiratory effect coupled with the destruction of permeable function of microbial cell membrane. After Anguilla japonia GFSE-injected to the body was incubated in the seawater contaminated by Vibrio vulnficus the fish meats were taken up, mixed with control diet and used as a diet in the feeding experiment. In this experiment the effect of GFSE treated with fish muscle on body weight protein efficiency ratio, serum enzymes and serum blood component of broiler chicks was investigated. It is proved from this study that there is neither Vibriosis nor toxicity associated with GFSE itself and fish meats treated with it when it is injected to the fish body at a level of 250 ppm or less.

청소년의 스포츠 참가와 대인관계 성향의 관계

박태근,서동균 京畿專門大學 2000 京畿專門大學 論文集 Vol.- No.28

The researcher sampled 193 students of middle schools in Seoul and Inchon. The purpose of this study is to investigate the relationship between youth's sport participation and interpersonal relations disposition and to provide a basis for the development of personality education policy about youth. Here the researcher set youth's sport participation as a independent variable. Independent variable is youth's sport participation as classified by participation mode. Interpersonal relations disposition as a dependent variable was classified by role disposition, sociometric disposition, and expressive disposition. The questionnaires designed for this study consist of items to represent each variable. The data collected from the questionnaires were by statistical analysis methods such as multiple classification analysis, ANOVA, correlation analysis and multiple regression analysis. The conclusions of this study, verifying the hypotheses about the relationships between youth's sport participation and interpersonal relations disposition found are as follows; Youth sport participants show positive interpersonal relations disposition more so than that of nonparticipationts.

사회체육활동과 청소년의 공격행동, 불안 및 스트레스와의 관계

양재근,서동균,김재현 한국학교체육학회 2000 한국학교 체육학회지 Vol.10 No.1

본 연구는 사회체육활동이 청소년의 공격행동, 불안 및 스트레스에 미치는 영향을 규명하는데 그 목적이 있다. 자료 분석을 위하여 사용한 통계기법은 ANOVA와 다중 범위 테스트이었다. 인지적·감정적 상태 질문지는 정신적 흥분과 스트레스를 측정하는데 사용되었다. 본 연구에서는 이러한 연구방법을 통해 다음과 같은 결론을 도출하였다. 첫째, 불안과 공격성과의 상관관계를 알아본 결과 상태불안과 공격성과는 0.38의 낮은 상관관계가 있으며, 특성불안과 공격성몬 0.65의 비교적 높은 정적인 상관관계가 있었다. 둘째, 사회체육프로그램이 적용되기 전과 적용된 후의 집단은 폭력(0.83), 부정성(2.00), 원한(1.83), 죄책감(2.50)에서 유의수준p<.05에서 통계적으로 의의 있는 차이가 있었다. The purpose of this study was to examine the Effects of Leisure Activities on violent action, anxiety and stress in Juvenile. Subjects of this study were sampled with 273 middle school students. Statistics employed in this study were ANOVA and multiple range test(Scheffe). Cognitive-Emotional State Questioner was used e test Psychological Anxiety and stress. Results were as follows. First, The relationship between conditional anxiety with trait eagerness was 0.38 and trait anxiety with violent action was 0.65. Second, The group which participated in physical activity showed meaningfully decreased rate of violent action(3.83), negative thought(2.00), hatred(1.83), sense of guilty(2.50) in p<.05. The two conclusion above shows, the sports participation affect juvenile's psychological state in positive way which increase positive lector for psychological well-being.

미디어 스포츠의 스포츠 마케팅 활용을 위한 시청자 분석

김대권,서동균 한국스포츠리서치 2001 한국 스포츠 리서치 Vol.12 No.4

This research made an investigation of media sports audience characteristic and watching behavior by survey about what kind of the TV audience looked and listened with interest media sports and about with what kind of reason watched television and about whether they found satisfaction in media sports after watching. Besides was investigated whether media sports as combination of TV and sports was related to the image improvement of enterprises and an extent of sport viewing. By the foundation, this research found whether can make use of media sports as sports marketing. The subjects of this investigation were selected 295 persons (over high school, male and female) in Seoul through cluster random sampling method. The analytic method was used by questionnaire. The findings of this study were as follows: First, there were differences according to sex, age and education level in the preference degree of media sports as well as in the audience amount of media sports. And there were differences according to sex and age in the viewing satisfaction degree of media sports. Second, there were significant differences according to sex and education level in the image of enterprises. And there were significant differences according to sex and age in the degree of game inspection. Third, there was an affirmative correlation generally among a viewing act of media sports, images of sponsor enterprises, the degree of game inspection.

노인의 생활체육 참가와 여가만족 관계 연구

강관희,서동균 한국스포츠리서치 2001 한국 스포츠 리서치 Vol.12 No.4

The purpose of this study is to research into the influence of the old-aged-man's socio-economic variables and the characteristics of their participation in sport for all on their leisure satisfaction, and the influence of their socio-economic variables on the characteristics of their participation in sport for all, and thereby to provide some basic data for the activation of sport for all as leisure and the formation of the old-aged-man's proper leisure activity. For the achievement of such a study, data was collected through some questionnaires from 300 old people whose age is more than 60. And the collected data was statically processed through SPSS/WIN7.5, and with frequency and % calculated, One-way ANOVA were done. Result are as follows: First, it appeared that socio-economical characteristics educational background, age, method to provide living expenses, living together with husband or not - have a significant relation with their leisure satisfaction. Second, it appeared that the questioning items concerning the characteristics of participation in sport for all - the frequency of participation, the time of participation, factor influencing sport participation, and persons wishing to participate in sport for all - have a significant relation with leisure satisfaction.

전류제어형 PWM컨버터를 이용한 동기발전기용 여자시스템에 관한 연구

장수진,류동균,서민성,김준호,원충연,이진국 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-

동기발전기 출력전압은 여자시스템의 계자전류 제어에 의해 일정하게 유지된다. 고주파 PWM 컨버터(전류제어모드 buck컨버더)형태의 여자시스템은 부하변동이 발생하였을 때 동기발전기의 계자전류를 제어하게 된다. 이 논문은 정상상태 및 과도상태에서의 안정화를 개선하기 위하여 여자시스템의 설계 및 실험에 대해 다루었다. 시뮬레이션 및 실험 결과는 제안된 여자시스템이 50kW 동기발전기의 DVR에 의해 응답시간이 개선되었음을 보여주었다. The output voltage of synchronous generator is regulated constantly by field current control in excitation system. High frequency PWM converter (current control mode buck conveter) type excitation system for synchronous generator is able to control exciter current when the load change happened. This paper deals with the design and evaluation of the excitation system for a synchronous generator to improve the steady state and transient stability. The simulation and experimental results show that the proposed excitation system is able to improve the response time by the DVR(digital voltage regulator) of 5O[kW] synchronous generator.

Carbachol에 의한 닭 췌조직내 nitric oxide synthase 활성 및 methylated arginine 함량변화

유세근,남석우,박승희,남태균,서동완,한정환,홍성렬,이향우 성균관대학교 약학연구소 1994 成均藥硏論文集 Vol.6 No.1

The role of nitric oxide (NO) in the regulation of exocrine secretion was investigated in chicken pancreatic tissues. Nitric oxide synthase (NOS) in the pancreatic tissues were Ca^2+-dependent form. Treatment of tissue with L-arginine (10 mM) or carbachol (10^-5 M) showed the increase of pancreatic exocrine secretion, but that of D-arginine (10 mM) did not. ^3H-citrulline formation, cyclic GMP level and methyl arginine contents in the homogenates of pancreatic tissues treated with carbachol were not affected. Although the action mechanism of NO in the pancreatic tissues remains unknown, NO apparently participates significantly in the overall control of pancreatic secretory function.

Twistable and bendable actuator: a CNT/polymer sandwich structure driven by thermal gradient

Seo, Dong Kyun,Kang, Tae June,Kim, Dae Weon,Kim, Yong Hyup IOP Pub 2012 Nanotechnology Vol.23 No.7

<P>We demonstrate a novel configuration of an electrothermal actuator (ETA), which is based on a polydimethylsiloxane (PDMS) slab sandwiched by upper and lower active layers of CNT–PDMS composite. When only one active layer of a single sandwich structure ETA is heated and the other is not, there exists a thermal gradient in the direction of the slab thickness, resulting in bending motion toward the unheated side. Moreover, a dual sandwich structure ETA, consisting of two parallel assembled sandwich structures on the same body, has the unique ability to act with a twisting motion as the two ETAs bend in opposite directions. We expect the advent of the bendable and twistable actuator to break new ground in ETAs.</P>