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.

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.

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.

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.

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.

족관절 내과골절에서 피질골 나사못을 이용한 변형된 긴장대 고정술

최호림,도현우,김병흠,김규현,박종석,송준민 대한골절학회 2004 대한골절학회지 Vol.17 No.4

목적 : 전위된 족관절 내과골절에 대해 피질골 나사못을 이용한 변형된 긴장대 고정술을 이용한 치료결과를 분석해 보고자 하였다. 대상 및 방법 : 2001년 1월부터 2003년 1월까지 전위된 내과골절에 대해 변형된 긴장대 고정술을 시행 받고 최소 1년 이상 추시관찰 가능 하였던 24례를 대상으로 하였다. 남자 13례, 여자 11례로 평균 연령은 46세였다. 골절은 Lauge-Hansen 분류법을 사용하였으며, 결과는 Meyer와 Kumler의 평가 방법을 이용하였다. 결과 : 13례 (54%)에서 우수의 결과를 얻었고, 9례 (38%)에서 양호의 결과를 얻었으며, 운동범위의 제한이 발생한 1례에서 보통, 후외상성 관절염이 발생한 1례에서 불량의 결과를 얻었다. 결론 : 전위된 족관절 내과골절에서 피질골 나사못을 이용한 변형된 긴장대 고정술은 견고한 내고정과 조기 관절 운동이 가능한 효과적인 수술 방법이 될 수 있을 것으로 사료된다. Purpose : To evaluate the clinical results of modified tension band wire technique using cortical screw for treatment of displaced medial malleolar fractures of the ankle. Materials and Methods : From January 2001 to January 2003, 24 patients were treated by modified tension band wiring using cortical screw for medial malleolar fracture. The follow-up period was 12~35 months (average 18 months). There were 13 males and 11 females, and the mean age was 46 years. Fractures were classified by Lauge-Hansen's classification. The results were analyzed by Meyer and Kumler's criteria. Results : There were 13 cases (54%) of excellent, 9 cases (38%) of good, and one case of fair because of limitation of motion of the ankle joint and one case of poor which showed post-traumatic arthritis of the ankle. Conclusion : Modified tension band wire technique using cortical screw can be an effective operative method for the treatment of displaced medial malleolar fractures of the ankle.

지역관광개발 영향인식과 지역주민 태도의 상관성에 관한 연구

최병길,송재호,김시영 제주대학교 관광과경영경제연구소 2004 産經論集 Vol.20 No.-

여성 하부요관석환자에서 무마취하 요관경하 배석술

박영호,송윤섭,임용순,김영호,이남규,구자현,서병욱,김민의,전윤수 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.2

Although ureteroscopy(URS) has been used widely to remove ureteral calculi, there is an argument against the belief that anesthesia or admission is needed for URS. We evaluated the experience of URS without anesthesia in female patients. From September 1997 to July 1998, URS was performed in 31 female patients without anesthesia. EHL(Electrohydraulic Lithotripsy) was used in 21 patients with impacted or large stone over 5mm. All patients were given oral antibiotics for 3 days and follow-up KUB was taken to confirm successful removal of the stone one week after the procedure. Successful treatment was defined as complete removal of the stone or residual fragments less than 2mm. Overall success rate was 96.7%(30 cases among 31 cases). All but one patient tolerated with analgesia through the entire procedures. There were only minimal complications such as mild flank pain and hematuria. So, we recommend that non-anesthetic ureteroscopic removal of stone as the first choice for treatment of lower ureteral stones in female based on the minimal morbidity, high success rate and low cost.

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./㎡).

하치조신경 및 설신경 손상 평가를 위한 한국인 정상 성인의 하순-이부 및 혀의 감각 조사

이종호,이세영,송승일,이은진,안강민,김성민,명훈,황순정,서병무,최진영,정필훈,김명진 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.2

In the head and neck area, there are so many sensory nerves, which are sometimes injuried iatrogenically or inadvertently so that involved patients complained of the loss of sensations. In such cases, it is important to judge the degree of injuries and regeneration of nerve for better diagnosis and treatment. Seddon and Sunderland's classification, which is commomly used, is focused on histological change and nerve conduction. As times goes by, it is difficult to access patient's sensory disturbance by this method. Until now, so many methods such as contract threshold, direction, two-point discrimination, pin prick, thermal discrimination and current perception threshold have been introduced for sensory evaluation. However, there hasn't been enough information regarding each methodology nor integrated standard methodology for the measurement. the purpose of this study is to get Korean adult normative sensory values of lower lip,chin and tongue using modified methods of contact thershold, ditection, two point discrimination, pin prick, thermal discrimination and assess degree of regeneration of sensory nerve damage.