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        과전류 보호계전기용 광섬유 전류센서

        송민호,양창순,안성준,박병석,이병호 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.5

        과전류 보호계전기에 사용할 목적으로 광섬유를 센서헤드로 사용하는 광 전류센서를 구성하였다. 전류측정의 원리는 도체 주변에 감겨진 광섬유 코일을 따라 광신호의 선형편광축이 자기장에 의하여 회전하는 정도를 측정하여 이로부터 전류의 값을 산출하는 편광측정 방법이 사용되었다. 센서코일은 10/125 mm 규격의 일반 통신용 광섬유를 미터당 20회전 이상 비틀어 제작하여 온도나진동 등의 환경적 영향을 최소화하였다. 코일의 한쪽 끝은 Faraday Rotator Mirror를 장착한 반사형으로 설계하여 계통을 해체하지 않은 상태에서도 센서의 탈×부착이 가능하고 코일의 회전수에 따라 센서의 민감도 조절이 용이하며 폐회로형 구조이므로 인근 신호원에 의한 간섭을 차단할 수 있다. 편광 빛가르개 등을 이용한 광학 신호처리부를 구성하고 표준 전류원을 이용한 전류측정 실험을 수행한 결과로 이론적인 해석과 동일한 형태의 출력을 얻을 수 있었다. 본 논문에서는 구성한 광 전류센서의 이론적 모델을 기술하고 전류측정 실험의 결과와 이론치에 대하여 비교 분석한다. A robust, accurate, broad-band, alternating current sensor using fiber-optics is being developed as a part of optical over current protection relay system. The sensor uses the Faraday effect in optical fiber and polarimetric measurements to sense electrical current. The current sensing coil consists of a length of twisted optical fiber and Faraday rotator mirror to suppress the linear birefringence effect. Due to its single-ended closed path structure, it can not only be easily installed to the target with great isolation from other fields in the vicinity, but the sensitivity can be increased by using multiple turns. This paper reports on the theoretical backgrounds of the sensor design and the preliminary experimental results.

      • 다중공선성에 관한 연구 : Based on Principal Component Regression and Factor Analysis

        송병호,최규정 조선대학교 통계연구소 2000 統計硏究所論文誌 Vol.2 No.1

        Regression diagnostics in the method of diagnosis accomplished for get more useful information in estimation of regression coefficient. And It diagnose investigation of error term hypothesis and correlation of independent variable, selection of fitted model, appearance of outlier. A value of measurement influenced effect by estimation of regression coefficient. If there is mighty correlation among independent variable than It is difficult to get converse matrix of X'X or The mean of regression analysis is decline because of variance of regression coefficient estimated is expand and there is no meaning parameter estimation of method of least squares. Multicollinearity is the case that it is difficult to get converse matrix of X'X or not exist as for being relation of mighty linear combination among of independent variable, each column of matrix. Therefore, In this thesis, there is a target to reduce multicollinearity through the method of principal component regression and factor analysis in method of solution and the way of diagnose multicollnearity like this. The method of principal component regression is the method of solve a problem that use principal component regression estimator was independent variable by principal component, in case appearance of multicollinearity. In case, data of complicated from are correlated, we will interpret for search a potential common factor that can explain correlation among variables throughout factor analysis. Solve the problem throughout the factor analysis, find potential common factor of complicate variables and establish of statistic model and then explain relation structure of variables and estimate factor score and that apply regression analysis.

      • 공간구조 분석에 있어서 GIS기술을 이용한 건축물 [근접성]의 정량화 방법에 관한 연구

        송병호,정명진,배상현 조선대학교 기초과학연구소 2003 自然科學硏究 Vol.26 No.-

        In this paper quantitative method about buildings and land use pattern is discussed by distance among near buildings(DNB). We considered the worth of DNB as urban planning method following two points : 1) DNB average and Building area ratio were pretty independent each other. That is to say DNB did not show density but arrangement. 2)DNB would express not just near buildings pattern and small vacant apace but also lot-street patterns. We analyzed following three steps. Firstly, we figured a calculating algorithm, secondly we analyzed characteristics of 4 index about DNB and statistical relations of DNB to building area ratio by each lot unit, thirdly we discussed combination patterns of DNB average and urban space pattern. The aim of this study is to theoretically develop a simple yet efficient system of data generation for urban planning and spatial structure analysis based on the application of GIS technique.

      • 건설 PMIS 실태와 건설 CALS 연계 및 확산방안에 관한 연구

        송병관,박영호,백준홍 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

        This study has aimed for wide spreading of CALS in Construction Industry. The PMIS produce original information of construction project linked to CALS. So, this study have investigated present state of PMIS in construction industry, and reviewed the interface to construction CALS. And, key issues of adopting PMIS & CALS to whole construction and its related industry have been found. Additionally, it has also found improvement issues of construction system and political supports for PMIS adoption.

      • 전류측정에 의한 AC서보모터의 언밸런스 고장검출

        송명현,조병호,김부열 순천대학교 2000 순천대학교 자연과학논문집 Vol.19 No.1

        Using current measurement, the analytic method for the unbalance fault detection of 3Φ induction servomotor was proposed. The fault detection of the load unbalance has been studied by means of the measure of vibration. In the conventional method, the additional vibration sensors are set up to measure the vibration properly, but the method introduced in this paper, a current sensor for motor control is used for measuring the load current, so there is no need for additional sensors. After measuring the current caused by unbalance load, the FFT spectrum of the measared current were analyzed and compared with the spectrum pattern of the balanced load. Varying the motor speed by 500, 1000, 1500 and 2000 rpm, some characteristic frequency for detecting the unbalance fault were found. These experimental results show that the proposed current measuring method is more simple, easy, and effective than the conventional vibration measuring method.

      • 프로폴리스 농도가 항균활성에 미치는 영향

        김병문,송근호,이광래 江原大學校 産業技術硏究所 2007 産業技術硏究 Vol.27 No.B

        The objetives of this study are to set up optimum extraction temperature, time and organic solvent for propolis extraction, to investigate chemical properties, and to develop health foods from propolis preparation. In this study, ethanol and ultrasonic extracts method performed to optimum extraction temperature was at 60, 2012, optimum extraction time was at 12, 4 hours and optimum extraction amount of solvent was at 20, 15 times of propolis weight. When various ethanol solutions were used, whereas flavonoid content was highest in 70, 80% aqueous ethanol, respectively. So the ultrasonic extracts method used gave better results than the ethanol extracts method in this work. Extraction of propolis with etanol and ultrasonic extracts method was performed by using the water and various concentrations of aqueous ethanol as solvent. Sensidvity of propolis samples to Staphylococcus aureus was invesdgated and the results were shown. Samples of water extract did not inhibit microbial growth, where as 50% aqueous ethanol extract the largest inhibitory zone for Staphylococcus aureus, then decreased inhibition with increasing ethanol concentrations.

      • 통신용 정류기 시스템의 모델링 및 제어기 설계

        신병철,송의호,양재석 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-

        This paper deals with the design of controller which is used to rectifier for communication. Mathematical small-signal modeling and characteristic analysis are performed about DC/DC converter and three-phase AC/DC converter. Bode plots are obtained by the mathematical small-signal modeling. By the PSpice simulation, performance of the controller is proved respectively in line regulation and load.

      • 성인 음낭수종의 치료로서 Window Operation의 효용성

        서병욱,박영호,이남규,전윤수,김민의,김영호,송윤섭,구자현 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.1

        We intended to determine the usefulness of window operation for adult hydrocele repair. We reviewed medical records of 132 patients from January 1995 to June 1998 with primary hydrocele and evaluated complications and recurrence rates of eversion and/or excision, plication, and internal drainage technique. Recurrence rate was highest in internal drainage technique as 85.2%, and those of eversion and/or excision and plication technique were 1.3% and 4%, respectively. Complication rate was highest in eversion and/or excision technique, and lowest in internal drainage technique. Although complication rate was lowest in window operation, this operation could not be successful due to high recurrence, and we suggest that this operation should be abandoned for hydrocele repair.

      • 夏節期中의 琴湖江의 水質調査 硏究

        朴炳允,染成鎬,李松愛 대구효성가톨릭대학교 1991 연구논문집 Vol.42 No.1

        In order to porvide the basic information for the conservation of Keumho river, pH, DO, BOD, COD, nitrate, phosphate and heavy metals were investigated at seven sampling sites(Yeungchun dam, Yeungseo bridge, Hayang bridge, Ayang bridge, Seobyun bridge, Paldal bridge, Gangchang bridge). The results were as follows. 1. The values of DO at other sampling sites except for the downstream of Yeungchun dam were lower than those of saturated DO, and, particularly, DO sag was observed at Gangchang bridge. 2. The value of BOD at Gangchang bridge was 13.3ppm, which exceeded the fourth grade of environmental criterion(8ppm). 3. The calue of COD at the downstream of Yeungchun dam was 2.1ppm, but the value of COD at Gangchang bridge, the most highly polluted site, was 27.6ppm, which exceeded the fifth grade of environmental criterion(8ppm). 4. The values of NH₃-N at Yeungseo bridge and Gangchang bridge were 1.93ppm and 1.94ppm, respectively, but those of other sampling sites were at range of 0.18∼0.60ppm The values of NO₃-N at seven sampling sites were at gange of 3.74∼16.32ppm. These values were very high in comparison with those of NH₃-N. 5. The contents of heavy metals at Gangchang bridge(Cu 0.27ppm, Cd 0.034ppm Mn 0.081ppm, Fe 1.742ppm, Zn 0.684ppm, Cr 1.018ppm) were higher than those of other sampling sites.

      • 함평만 갯벌 조간대의 식생분포 및 현존량

        이승호,이점숙,김종욱,김하송,임병선 木浦大學校 沿岸環境硏究所 1998 沿岸環境硏究 Vol.15 No.1

        함평만 조간대 염생식물조사를 위하여 염생식물군락이 형성된 6개지역을 선정하여 식생분포 및 현존량을 조사하였다. 우점군락은 퉁퉁마디군락(Salicoenia herbacea community), 칠면초군락(Suaeda japonic community), 나문재군락(Suaeda asparagoides community), 좀보리사초군락(Carex pumilalini community), 가는갯능쟁이군락(Atriplex gmelini community), 갯개미취군락(Aster tripolium community), 갯잔디군락(Zoysia sinica community), 해홍나물군락(Suaeda maritima community), 갯질경군락(Limonium tetragonun community), 갈대군락(Phragmites communis community), 실망초군락(Erigeron bonariensis community)으로 구분되었다. 염생식물 군락의 생산량은 1,680∼2,170 g.d.w./㎡으로 갈대군락이 가장 높았고, 갯잔디 군락이 310∼500 g.d.w./㎡으로 가장 낮았다. The coastal vegetation was classified by the Braun-Blanquet's method and the biomass was investigated at the wetland of Hampyung-Man. The vegetation of the study area was classified with 11 coastal communities as follows: Salicornia herbacea community, Suaeda japonica community, Suaeda asparagoides community, Carex pumilalini community, Atriplex gmelini community, Aster tripolium community, Zoysia sinica community, Suaeda maritima community, Limonium tetragonun community, Phragmites communis community, Erigeron bonariensis community, Biomass was highest in Phragmites communis community (1,680∼2,170 g.d.w./㎡) and lowest in Zoysia sinica community (310∼500 g.d.w./㎡).

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