• Restorative Dentistry and Endodontics
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• 제30권6호
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• pp.477-485
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• 2005

근단부위 형성이 완료되고 우식이 없는 하악 대구치 근심치근 50개를 대상으로 주파수 의존형 전자근관장 측정기를 이용하여 측정한 근관장의 정확도를 평가하기 위해 치수강 개방 후 동일한 치아에서 방사선 사진으로 확인한 실측 근관장을 대조군, 각종 전자근관장 측정기로 측정한 근관장을 실험군 ( I군: Root-ZX, II군: Bingo, III군: Propex, IV군: Diagnostic)으로 분류하여 근심협측과 설측의 근관장을 근관의 입구 측으로부터 치근단 1/3까지 확대여부 및 서로 다른 측정시기에 측정하여 비교 평가한 결과 다음과 같은 결론을 얻었다. 하악대구치 근심치근의 협측과 설측 전자근관장은 측정기의 종류, 근관의 입구 측으로부터 치근단 1/3까지의 확대여부 및 측정시기에 상관없이 0.5mm이내의 오차범위를 나타내었으며, 근관치료시 오차한계인 ${\pm}1mm$에서 정확성은 근관의 입구 측으로부터 치근단 1/3까지 미리 확대한 후에 근관장을 측정할 경우와 측정시기가 반복될 경우에 증가되는 경향을 보여 임상에 유용하게 활용할 수 있을 것으로 사료된다.

• 한국공작기계학회논문집
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• 제14권3호
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• pp.8-15
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• 2005

A new measuring method for tool deflection has been developed when sculptured surface is processed in ball-end milling. Since the vibration due to cutting forces has low frequencies, an electromagnetic sensor is used for measuring the exact vibration displacement. The amplitude and direction of vibration displacement during the cutting process is presented as orbital plot. In this study, it assumes that the vibration displacement is proportional to the length of cutting chip. Therefore, tool deflection is calculated by summing up the vibration displacement of unit chip length for engaged chip length. In addition, computer programs has been developed to predict the deflection of tools when machining sculptured surface. This developed program predicts the tool deflection per block of NC data, so that it can easily identify the parts which have the possibility of machining errors.

• International Journal of Precision Engineering and Manufacturing
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• 제7권2호
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• pp.56-59
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• 2006

A vibrational model of powder transfer equipment based on the lumped parameter method was developed, in which the operating motion consists of surging, bouncing, and pitching. After decoupling the equation of motion, the vibrational excitation source of the pitching motion was removed. So the designers are able to plan the optimum design to adjust the motion trajectory of the powder transfer equipment. That is, a procedure to adjust the motion trajectory of powder transfer equipment by changing design specifications such as the installation position, the direction of the motor, the driving speed, the mass unbalance, the stiffness coefficient, and the installation position of the support spring, is presented in this paper. The powder transfer equipment manufactured according to the results of this study did not suffer fatigue destruction, since the maximum stress on the basket structure was sufficiently small.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.47-48
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• 2006

A roughness measuring system which comprises an integrating sphere and a stabilized laser has been fabricated with the aim of measuring the roughness correction value which is necessary in gauge block measurement by optical interferometry. To calibrate the system, a Newton's ring interferometer has been introduced. The method how to calibrate the roughness measurement system has been described.

• 한국음향학회지
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• 제18권5호
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• pp.63-67
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• 1999

최근 들어 실내음향 특성의 측정과 평가를 위해 백색잡음을 이용한 잔향시간 측정법 대신에 임펄스응답을 이용한 측정법이 널리 이용되고 있다. 이 방법은 재현성이 우수하고 다양한 실내음향 특성치들을 한꺼번에 산출할 수 있어 전통적인 잔향시간 측정법에 비해 여러 가지 장점을 가지고 있다. 본 연구에서는 MLS(Maximum Length Sequence) 신호를 이용하여 실내에서의 임펄스 응답을 측정하고 이를 후처리(post-processing) 하여 잔향시간(EDT, RT), 명료도 지수(C50, C80, D, U50, U80, AI), 음의 크기 지수(G) 등, 주로 실의 음성음향 성능을 측정하는 시스템을 구축하였다. 본 연구에서는 측정시스템과 후처리 프로그램의 구성, 몇몇 실내공간에 대한 시험 측정의 결과 및 고찰 등에 대해 소개하고자 한다.

• 한국정밀공학회지
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• 제10권4호
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• pp.104-108
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• 1993

The linear length measurements are most frequently performed and should be most accurate among other parts in dimensional metrology. We developed the linear measuring system using a laser interferometer to improve the accuracy and to shorten the calibration time. The uncertainty of the system is 0.01 .mu. for 500mm steel gage block. The range of the measurement and resolution of the system are 1000mm and 0.01 .mu. m, respectively.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.792-801
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• 1996

A thinning algorithm -based image analysis technique was developed to measure corn root lengths. The root length measurement method was evaluated by comparing thread lengths measured by the image analysis system with actual thread lengths. The length measurement method accurately estimated actual thread lengths (less than 2% calculated error). Also, a rapid root length density measurement procedure, which utilizes the above root length measurement method, was developed to estimate corn root length density without washing the roots. Root length densities estimated from the cut soil surface of core samples taken from the field were paired with the root length densities determined from washed roots from the same soil core sample. A linear relationship between these two values was expected and was found. Eliminating the root washing procedure reduces the time required for measuring corn root length density substantially.

• 한국초등과학교육학회지:초등과학교육
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• 제33권1호
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• pp.181-194
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• 2014

The purpose of this study was to analyze the difference between eye movements according to science achievement of elementary school students on measuring tasks. Science achievement was graded by the results of Korea national achievement test conducted in 2012. As an assessment tool to check measuring task, two measuring measure problems from TSPS(Test of Science Process Skill; developed in 1994) which were suitable for eye tracking system were adopted. The subjects of this study were 3 underachievers and 3 overachievers from 6th grade who agreed to participate in the research. SMI was used to collect EMD (eye movement data). Experiment 3.2 and BeGaze 3.2 programs were used to plan experiment and analyze EMD. As a result, eye movements of participants in measuring task did not show the path to the common gaze by groups. To solve the problem of using specific measuring strategies related to the correct answer. Underachiever who failed in measuring tasks don't have enough measurement capabilities and lack eye movement through the area of interest for cognitive thinking. These results show that elementary school science curriculum dealing with measuring have to reflect a lot of step-by-step learning requires.

• 근관절건강학회지
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• 제19권1호
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• pp.27-36
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• 2012

Purpose: The purpose of this study was to investigate the leg length Inequality, habitual posture, and pain in women's college students. Methods: The subjects were 281 students, in 8 women's college in Korea. The tapelines were used for measuring leg length Inequality and questionnaires were used for measuring habitual posture, and pain. The data were collected between August and October 2010 and analyzed using SPSSWIN 11.5. length Inequality(<1 cm). The subjects of 2.8% were the length differences of above 2cm. The worst habitual posture were leaning habits. Especially, the habits of crossing her legs were significantly different to leg length Inequality(F=3.342, $p$=.037). The subjects of 84% were felt a severe pain on the upper body such as waist, back, scapula, neck or shoulder. But there is no difference between pain and leg length Inequality. Habitual posture are related to pain(r=.212, $p$=.001). Conclusion: To protect the severe health problem of musculoskeletal system, this study results will be give aid to health education in women's college students.

• 대한물리치료과학회지
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• 제15권1호
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• pp.57-66
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• 2008

This study was conducted to investigate the effects of kinesio taping in patients with degenerative arthritis. 40 female patients with degenerative arthritis were voluntarily recruited and randomly divided into experimental and control group. Experimental group(mean age was 73.4 years, height was 153.5cm, and weight was 59.9kg) was applied patellar inferior and medial gliding, quadriceps, tibial external rotation, gastrocnemius, and soleus using a kinesio tape. And control group(mean age was 72.7 years, height was 154cm, and weight was 58.6kg) was received a interferential current therapy(ENDOMED 582, Enraf－Nonius, Holland). And we received a consent form from all subjects. Measuring was conducted by using a 3－dimensional gait analysis system for measuring of stride length, cadence, and velocity. The results were as follow: Stride length was significantly increased after than before treatment(p<.05). Cadence was significantly increased after than before treatment(p<.05). And Velocity was significantly increased after than before treatment(p<.05). Cadence was a significant difference between experimental and control group(p<.05), but there was no significant difference stride length and velocity between two groups. So we suggest that kinesio taping has a effectiveness in patients with degenerative arthritis.