임신 40주와 출산 후 6주에 있는 20대 임산부 보행의 역학적 특성 비교

윤희중,문동안,정남주,금명숙,이경식,유실,김영란,한윤수 한국운동역학회 2000 한국운동역학회지 Vol.10 No.1

본 연구는 임신 40주와 출산후 6주간에 있는 임산부의 보행 동작의 특정을 규명함으로써 이와 관련된 연구자들에게 기초자료를 제공하고자 실시하였다. 이를 위해 임신 4주에 있는 임산부를 대상으로 1차 실험을 실시하였으며 동일한 대상자를 출산후 6주에 2차로 실험하여 자료를 수집하였다. 디지타이징 시 오차를 최소화하고 인체관절점의 분별을 위해 21개의 반사마커를 부착하였다. 10m의 보행주로를 걷는 동안 두 대의 비디오카메라를 이용하여60Hz로 자료를 수집하였으며 동시에 100Hz 지면반력자료를 수집하였다.수집되어진 자료는 DLT 방법을 사용하여 분석하였으며 이의 분석에 Kwon3d 프로그램을 활용하였다. 분석결과 다음과 같은 결론을 얻었다. 1. 임신 40주와 출산 후 6주의 보행 시 지지시간과 스윙시간의 비율이 다르게 나타났으며 보폭과 보간, 활보장은 임신 40주에서 더 큰 값을 보였다. 상체 전경각 역시 임신 40주에서 더 큰 값을 보였다. 힙관절, 무릎관절, 발목관절각도는 S1이 출산후 6주에서 큰 값을 보인반면 S2는 출산전후에 큰 변화를 보이지 않다. 2. 상하지면반력의 경우 FP1과 FP2는 임신 40주보다는 출산 6주에서 큰값을 보였지만 FP3는 임신 40주에서 보다 큰값을 보이고 있었다. 전후지면반력의 경우 출산전과 후 모두 Fy2에서 보다 큰 값을 보이고 있었다. This Study was to investigate kinematical characteristic comparison of the gait pregnant 40weeks and after delivery 6weeks 20´s women and provide the basic data. To accomplish this study, in the first, carry out an experiment with the pregnant women in the pregnant 40weeks on the videotape, and than the second, make an experiment with the kinematic data. Kinematic data were filtered with a low-pass, fourth-order Butterworth filter with an effective cut off frequency of 6Hz. The conclusions were drawn as follows; 1. Floor contact Periods(stance and swing rate) were differed from before and after the delivery and a pregnant 40 weeks was greater than after delivery 6 weeks in the step, width, stride. Also, a pregnant 40 weeks was greater than after delivery 6 weeks in the front angular. And the other angular components were represented similar pattern. 2. In the vertical load, delivery 6 weeks was grater than a pregnant 40 weeks in the FP1(first peak) and FP2(valley). And FP3(second peak)was represent that a pregnant 40 weeks was greater than delivery 6 weeks. Also, in the horizontal shear, Fy2(progressional force)was greater than Fy1(breaking force) about time of the delivery.

데오드라이트 시스템의 측정 정확도에 대한 연구(Ⅱ) : 기준자 측정 높이에 따른 측정 정확도 A Measurement Accuracy for a Height of Scale Bar

윤용식,이동주,정종길 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.4

A measurement accuracy of theodolite system may be affected by a measurement environment, a measurement distance change and so on. This study was performed for measuring an accuracy when the height of scale bar is changed 0.05m, 0.5m, 1m and 1.5m under the distance 3m between two theodolites, the distance 4m from the theodolite system to scale bar and the distance 5m from the thodolite system to the horizontal target bar. And we could know that the best height is 0.05m and 1m.

데오도라이트 시스템의 측정 정확도에 대한 연구(Ⅰ) : 데오도라이트 시준 거리에 따른 측정 정확도 A Measurement Accuracy According to a Theodolite Collimation Distance

윤용식,이동주 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.2

A non-contact precision measurement system is a theodolite system, a laser tracker and a photogrammetry system. etc. Nowadays, the system reaches to a limit of measurement accuracy required from industrial product of middle and large scale. The one of the solutions for this problem is to maximize the accuracy of the existing measurement system. According to it, we performed the study for a measurement accuracy of theodolite system when the distance between two theodolites is changed lm to 5m We could know that the changes of distance affect the measurement accuracy of theodolite system and that the maximum measurement accuracy is ± 0.02 mm on theodolite distance 3~4 m.

데오도라이트를 이용한 위성체 얼라인먼트 측정에 관한 연구

윤용식,이동주 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.6

A measurement of spacecraft alignment is an important process of spacecraft assembly, integration and test because it is necessary that a ground station controls the precise positions of on-orbit spacecraft by using the alignment data of attitude orbit control sensors(AOCS) on spacecraft. In addition, accuracy of spacecraft alignment requirement is about 0.1°- 0.7°. The spacecraft alignment is measured by autocollimation of theodolite. This paper describes the measurement principle and method of spacecraft alignment. The result shows that all of the AOCS on the spacecraft are aligned within the tolerance quired through the alignment measurement.

데오드라이트 시스템의 측정 정확도에 대한 연구(Ⅲ) : 시준거리 3m에서 기준자 거리에 따른 측정 정도 A Measurement System Accuracy depending on a Distance of Scale Bar on the Distance 3m between two Theodolites

윤용식,이동주,윤인진 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2

The theodolite system consists of two theodolites, a scale bar and a target bar. A measurement accuracy of theodolite system is affected by a measurement distance of each equipment. This study was performed for measuring an accuracy when the distance from theodolite to scale bar was changed 2~6 m on two theodolites distance 3 m. The results showed that the measurement accuracy could be ±0.021 mm when the distance from theodolite to target was 2, 3 and 6 m. Specially, it was found that the maximum measurement accuracy was ±0.017mm on theodolite collimation distance 3m and the distance 4 m of the theodolite and scale bar.

데오도라이트 시스템의 측정 오차 요인에 대한 연구

윤용식,이동주 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.4

Theodolite measurement system is non-contacted 3-dimensional measurement system. The system accuracy is ±0.5mm or better for distance 0~100m. And the system is used for the measurement of a product of middle and large scale. This study is performed for the measurement error factors of the system. We could know that the main measurement error factors are temperature, illumination and skill. Also, we performed the study for the effect according to the height difference of scale bar.

초음파검사자 기량검증 체제를 위한 다자비교시험

윤병식,양승한,김영호,김용식,양동순 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.4

국내 원자력발전소의 Class1과 Class2 배관검사에 적용할 수 있는 초음파탐상 검사자, 장비 그리고 절차서에 대한 한국형 기량검증(KPD) 시스템을 구축하였다. PD 방법을 적용한 검사결과와 전통적인 dB-drop 방법을 이용한 검사결과를 상호 비교하기 위하여 Round Robin Test(RRT)를 수행하였다. RRT 결과는 PD 방법의 신뢰성이 dB Drop 방법보다 우수한 것으로 나타났다. 이러한 결과로부터 원자력발전소 가동중검사에 PD 방법을 적용함으로써 초음파탐상검사 결과의 신뢰성이 더욱 향상될 것으로 기대된다. The Korean Performance Demonstration(KPD) System for the ultrasonic testing personnel, equipments and procedures applicable to the Class 1 and 2 piping examination for nuclear power plant in Korean has been established. A round robin test was conducted in order to compare the examination results by the method of Performance Demonstration(PD) with the traditional dB-drop method. As a result, adoption of the PD method to the in-service inspection of the nuclear power plants will improve the reliability of the ultrasonic test results.

통풍성 관절염의 임상적 고찰

윤채중,정승문,김영학,김동규,허광식,김태원,배학연,정종훈,이승일,김평남 朝鮮大學校 附設 醫學硏究所 1997 The Medical Journal of Chosun University Vol.22 No.2

통풍은 Purine 대사의 이상으로 발생하는 질환으로, 고뇨산혈증인 사람의 전부가 통풍으로 발현되지 않고 증상의 출현 양상이 다양하여 진단과 치료에 주의가 필요하며, 조기에 적절한 조치를 한다면 충분히 조절이 가능한 질환이다. 본대학 내과학교실에서는 통풍으로 치료한 32명의 환자에서 임상양상, 병력과 검사소견을 분석하여 다음과 같음 결과를 얻었다. 1. 32명 모두 남자이며, 최초 발병 시기는 24세에서 72세로 평균 43.8±11.9세이었으며, 30대에서 40대까지가 19명(59.4%)으로 대부분을 차지하였다. 내원 당시 나이는 27세에서 75세까지로 평균 52.3±10.4세였으며, 내원시 까지 평균 유병기간은 8.5±6.8년으로 나타났다. 2. 동반 질환으로는 고지혈증 12례, 신장질환 10례, 고혈압 12례, 비만 8례, 당뇨 2례 등이었다. 3. 이환된 관절은 단관절 침범이 19례(59.4%), 다관절 침범이 13례 이었으며, 최초 이한된 관절은 족무지 중족골지골 관절로 19례(59.4%)로 가장 많았고, 통풍 결절은 20례(62.5%)에서 관찰되었으며, 유병기간이 10년 이상된 12례중 11례 (91.7%)에서 결절이 관찰되었다. 4. 평균 혈중 요산치는 9.17±1.75 ㎎/dl이었으며, 8.0 ㎎/dl에서 9.9 ㎎/dl 사이가 19명으로 전체의 59.4%를 차지하였다. Objective: The gout is a heterogeneous group of diseases resulting from tissue deposition of monosodium urate or uric acid crystals from extracellular fluids supersaturated with respect to this end product of human purine metabolism. The clinical manifestations are such as hyperuricemia, gouty arthritis, gouty nephropathy, uric acid nephrolithiasis. We analyze of clinical manifestations and associated factors in gout. Method: We have reviewed the medical records, radiologic findings and clinical results of thirty-two patients admitted at our department from April 1996 to July 1997. Result: 1) All patients were male. The mean age at initial attack was 43.8 years old, ranging from 24 to 72 years old. 2) The mean level of serum uric acid was 9.17mg/dl on admission. 3) The first metatarsopharyngeal joint was involved in 19 cases (59.4%). Tophus was observed in 20 cases (62.5%). 4) Hyperuricemia was associated with hypertension, obesity, nephrolithiasis and hyperlipidemia.

매스매티카를 이용한 광대역 혼합트래픽의 분석

윤복식,김동석,성시영 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.4 No.-

Since the introduction of Mathematica in 1988, it has been succesfully utilized in various research fileds including mathematics and physics. In this study, we use the numerical and graphical power of Mathematica to analyze the voice traffic and the video traffic mixed with voice traffic under the B-ISDN environments. We adapt the fluid flow approximation as the basis of traffic modelling. The individual video source is modelled as a 3-state continuous time Markov chain. We present both numerical examples and Mathematica procedures in order to demonstrate the convenience of Mathematica as well as the validity of the model.

수명 검사 자료의 분석 방법에 관한 연구

윤복식,김동석 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-

Life testing data has some peculiar features which can be utilized for proper statistical analysis. Among others it has the bathtub curve describing the change of the failure rate according to the elapsed time. In this paper, we review various efforts to get life distributions fitted for the bathtub-like failure rate function and propose simple and effective life distribution models based on piecewise Weibull failure rate function. Also, we introduce a simple method to estimate the failure rate of the censored life testing data. We can utilize the results in this paper to develop a comprehensive computational tool for reliability analysis.