• Journal of Periodontal and Implant Science
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• 제30권2호
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• pp.455-472
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• 2000

Instrumentation for periodontal therapy may induce marginal damage which increases plaque accumulation and result in periodontal disease. But there have not been many reports of instrumentations on the artificial crown so far. Therefore this study is conducted to evaluate the effects of various repeated instrumentations on the porcelain crown marginal portion. Of the 10 extracted periodontally diseased maxillary first premolars, were 12 proximal surface used in this study. The finishing line of the preparation was placed on the root surface below CEJ and then the crown was cast and cemented in usual manner. Every 4 surfaces of the 3 instruments-curet, ultrasonic scaler, and ultrasonic curet- is used. and four samples used in each instruments. The relevant procedures and measurements were repeated 3 times in each surfaces. Marginal gap is measured by the microscope and surface roughness, Scannig Probe Microscope. Measurements are made at 5 points in each surfaces, making 20 points in each instrument. The results evaluated statistically were as follows 1. As instrumentation was repeated, both marginal gap and roughness were increased in all group 2. In the hand curet, marginal gap was increased every instrumentation and roughness was increased after second. 3. In the ultrasonic scaler, both marginal gap and roughness were increased every instrumentation. 4. In the ultrasonic curet, marginal gap was increased after third instrumentation and roughness was increased after second. 5. Marginal gap and roughness used by the ultrasonic curet were lower than the others and no difference was seen between the hand curet and ultrasonic scaler From the results of this study, the ultrasonic curet was useful in some aspect, but careful instrumentation was needed. Furthermore it was important to minimize the instrumentation through complete periodontal therapy before setting and adequate plaque control.

• Toxicological Research
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• 제15권1호
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• pp.27-34
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• 1999

To study the nature of differentially manifested adaptive response of an organism according to the intensities of the stress, the immune effects of different levels of repeated hypoxia were investigated. Four experimental groups (NH : not -handled, 20% : handled, 15% or 10% : exposed to 15% or 10% $\textrm{O}_2$ 씨오투 with balanced nitrogen, respectively) of mice were exposed to different levels of hypoxia for 60 min/day, 5days/week in a repeated and intermittent manner. After 8 weeks' exposure to hypoxia environment, mice were subjected to immune function measurements, A decreased proportion of CD3+ CD8 phenotype cells in the study of splenocyte subsets was observed in the 10% group. Ovalbumin-stimulated IgG2a production was increased in the 15% group, while no changes were noted in the IgGl and IgM production. No significant changes of the antigen-stimulated splenocyte proliferation and the natural killer cell cytotoxicity were found. These results show that the stress effects on the immune systems can be varied according to the strength of the stress and that a mild level of repeated hypoxic stress can enhance the immune function of mice in this experimental model.

• 한국수학사학회지
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• 제12권1호
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• pp.1-12
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• 1999

The first part of this thesis discusses the types and the properties of errors, one of which makes up systematic errors of measurements, removable by detecting their causes, the other errors of accidental causes which can not be removed. The final part of this thesis deals with the historical background of the Gaussian distribution by Hershel, Hagen, Laplace and Gauss from the late 18th century to the early 19th century. It can be concluded that the accidental idea and the treatment of accidental error distribution by Gauss Is the best one based on the assumption that the most probable value of true value is the arithmetic mean of data, obtained by repeated measurements of a given quantity.

• 대한물리의학회지
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• 제10권2호
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• pp.95-98
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• 2015

PURPOSE: This study was conducted to devise a method of preventing water infiltration into the surface electrodes during EMG measurements underwater and on the ground and to check the reliability of Electromyography (EMG) measurements when underwater. METHODS: Six healthy adults were selected as subjects in this study. The measurements in this study were conducted in pool dedicated to underwater exercise and physical therapy room in the hospital building. An MP150 (Biopac Systems, US, 2010) and a BioNomadix 2-channel wireless EMG transmitter (Biopac Systems, US, 2012) was used to examine the muscle activity of rectus femoris, biceps femoris, tibialis anterior, gastrocnemius of dominant side. The subjects repeated circulation tasks on the ground for more than 10 min for enough surface electrode attachment movement. After a 15-min break, subjects performed the circulation task underwater(water depth 1.1m, water temperature $33.5^{\circ}C$, air temperature $27^{\circ}C$), as on the ground, for more than 10 min, and the MVIC of each muscle was measured again. SPSS v20.0 was used for all statistical computations. RESULTS: The maximum voluntary isometric contraction (MVIC) values between the underwater and on the ground measurements showed no significant differences in all four muscles and showed a high intraclass correlation coefficient (ICC) of >0.80. CONCLUSION: We determined that EMG measurements obtained underwater could be used with high reliability, comparable to ground measurements.

• 한국전문물리치료학회지
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• 제20권3호
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• pp.74-80
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• 2013

The purpose of this study was to determine the reliability of distance measurements from the medial border of the scapula to the spinous process of the thoracic vertebrae when obtained using tape and photography measurements. The study included 20 healthy subjects (10 males, 10 females); for a total of 40 scapula measurements. The distance measurements made using tape or photography methods were conducted with the subject in a standing position. Repeated tape and photography measurements were conducted in two sessions on different days by two examiners to assess the inter-rater and intra-rater reliability of the two methods. The reliability of scapular distance measured using tape and photography methods was tested using intraclass correlation coefficients (ICC(3,1)) and the standard error of measurement (SEM). The inter-rater reliability of the tape measurement method was excellent (ICC=.77) and the intra-rater reliability was fair to good (ICC=.74). The inter-rater and intra-rater reliabilities of the photography measurement method were excellent (ICC=.76 and .76 respectively). Our results suggest that photography measurement is an objective and qualitative measurement tool for scapular distance measurements.

• Communications for Statistical Applications and Methods
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• 제16권6호
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• pp.945-957
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• 2009

의약학 분야에서는 여러 집단에서 하나의 반복요인을 가지는 반복측정 자료가 많이 사용된다. 이 논문에서는 대조군과 처리군들의 시간에 따른 반응값의 선형추세를 비교하기 위하여 각 개체의 기울기를 추정하고 추정된 기울기들에 의해 생생된 표본으로 F-test, Jonckheere-Terpstra test, updated control group procedure를 이용하여 대조문과 처리군들의 차이를 검정하는 방법을 제안하였다. 모의실험 (Monte Carlo Simulation)을 통해 실험유의수준(experimental significance level)과 검정력(power)을 비교하였다.

• 대한정형도수물리치료학회지
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• 제24권2호
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• pp.9-15
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• 2018

Background: The purpose of this study was to compare the effects of mulligan taping on knee joints on balance ability and strength with repeated measurements. Methods: Seventeen patients were randomly assigned to the 8 taping group and the 9 repeat measurement group. To measure the balance ability, fall risk assessment equipment was used, and the measurement of the muscle strength was performed by using the equipment of the same company. Results: Balanced abilities and muscle strength were increased in groups with taping only after Mulligan taping. Conclusions: The application of mulligan taping did not have the effect of stimulating the inherent receptive sensation. However, active grouping of the knee joint taping only, and muscle strength and muscle strength were increased. It increases the stability and activity of the muscles that operate on the balance of the active knee joint and muscle strength, thereby enhancing exercise prevention and prevention performance and exercise performance.

• Industrial Engineering and Management Systems
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• 제9권1호
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• pp.20-27
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• 2010

The purpose of this study was to compare the consistency of external ear measurements obtained by electronic digital caliper, photocopier scanning and digital photographic methods. Photogrammetric measurements were made after image editing software was used to optimize the brightness, contrast, size and image clarity. The CorelDRAW dimension tool was used to create a dimension line that measured the vertical and horizontal length between any two landmarks. Results of repeated measures analysis of variance revealed no significant differences in length and width of the pinna between the three methods. The reliability of the three measurement techniques showed a high degree of consistency. Further study and efforts could be extended to measurement hands, foots and facial dimensions by present techniques.

• 응용통계연구
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• 제21권2호
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• pp.291-299
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• 2008

동일 개체가 여러 시점에서 반복되어 측정될 때, 측정값들 간에 종속성을 예상할 수 있다. 본 논문은 한 개체의 이가 반응변수가 g개 시점에서 관측될 때, 종속적인 g개 이 가변수들의 다변량 분포로부터 각 시점에서의 주변분포의 동질성을 파악하기 위한 로짓모형을 제시하고 자료분석 방법을 제공하고자 한다. 모형과 관련된 가정으로 반복측정이 행해지는 g개 시점은 각기 서로 다른 요인 또는 공변량의 결합수준들로 구성된다고 가정한다. 또한, 모형에서 고려된 처치들이 반복측정에 기인하는 서로 다른 크기의 실험 단위들에 행해질 때 모수들을 추정하기 위한 방법으로 가중최소제곱법을 다루고 있다. 여기서 가중최소제곱법은 반응변수들의 종속성으로 인한 공분산 구조에 근거한 모형내 모수들의 효과를 효율적으로 추론하기 위해 이용된다. 제시된 모형은 주변로짓을 이용함으로써 단순히 주변확률분포의 동질성에 대한 검정뿐만 아니라 모형의 타당성 및 요인들의 수준변화에 따른 효과를 파악하기 위한 효과적인 모형임을 보여준다.

• 치과방사선
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• 제27권2호
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• pp.105-116
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• 1997

The purpose of this study is to evaluate the cephalometric reproducibility in digitized cephalometric radiography by comparing the measurement errors between the remeasured and retaken conventional and digitized lateral cephalometric radiography. The mean of the differences and error percentage of each cephalometric measurement were obtained using 96 lateral cephalometric radiography from 48 patients between the age of 11 and 13. The results were as follows; 1. The repeated measurement group of conventional radiography showed least amount of mean differences while those of the retaken measurement group of digitized image showed largest amount of mean differences in every measurement. 2. The measurements which showed statistically significant difference between the conventional radiography and digitized image were S-Go, Ar-Go, S-Ar-Go and S-sN-sNT in repeated measurement group. 3. The measurements which showed statistically significant difference between the repeated and retaken measurement groups were N-S-Ar, MP-Ll and S-sN-sPog in conventional radiography and S-N, Go-Me and N-A in digitized Image. 4. Large amount of error percentage was shown at A-N-B and N-A in retaken measurement group of conventional radiography and N-S-Ba and A-N-B in retaken measurement group of digitized image. 5. The amount of error percentage at Ar-Go and N-S- Ar in retaken measurement group of conventional radiography and S-N, N-A, S-N-B and N-S-Ba in retaken measurement group of digitized image was more than double than those from remeasured groups.