• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.880-883
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• 2006

The reduction of tool vibration has been a serious issue for both employers and workers because of the risks of vibration transmitted to the workers. In this study a hand-arm vibration measurement and evaluation system was developed based on ISO 5349:2001 and used for analyzing relation of vibration level and components of tools. This system consists of a notebook PC installed a LabVIEW program and the data acquisition system including two 3-axial accelerometers and a NI-DAQ card. Vibration measurement tests were conducted for eight angle grinders and four impact wrenches where 3 subjects were used for each of the tools. The relation between different components of each tool and its vibration total value made it possible to set-up a guideline of tool design. In the past engineers developed tools by using their experience and intuition, but by using this system it became possible to design tool components so as to minimize the risks of hand-transmitted vibration.

• 지역사회간호학회지
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• 제15권3호
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• pp.419-437
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• 2004

Purpose: This study aims to analyze the trends of the gerontological nursing researches in Korea and suggest the direction for research in this nation. Method: A total of 241 dissertations and other published articles in Korea from 1997 to 2003 were analyzed in this study focusing on the design of the research, key words, measurement tools for basic concepts, and the intervention outcomes in the case of the experimental research. Result: Of those analyzed researches. it was found that 80.9% accounted for the published articles and 19.1% dissertations. There were no clear criteria for the classification of the old men. The most popular research design was an exploratory/descriptive study (54.4%). The major concepts were about 'physical and mental health'. Most of the measurement tools used were developed by foreigners. which were translated into Korean. Among 56 experimental studies, nursing intervention programs in 22 studies were based on physical exercise programs. Conclusion: It is necessary to analyze the trend of gerontological health research in comparison with multidisciplinary researches for elderly people. In addition, the experimental researches for both development and verification of nursing intervention programs are needed. Also, accumulation of research outcomes and development of a standardized instrument for the measurement of Korean elderly people are required.

• 한국정밀공학회지
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• 제9권1호
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• pp.82-95
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• 1992

There is the high interest for sensing of tool wear with the aim of controlling machine tools productivity from the point of view of qualitity. Difficulties in this measurement are also known. This study is on the development of measurement setup for crater wear by CCD image inturning. In this study, the crater wear measurement system consists of the He-Ne gas laser, diffraction grating. CCD camera, noise filter, slit, microcomputer, diverging lens, converging lens and so on. He-Ne laser beam passes through a diverging lens and a diffraction grating is positioned properly. A converging lens focuses so that the interference fringes can be obtained on the crater wear. Performance test revealed that the developed image technique provides precise, absolute tool-wear quantification and reduces human measurement errors. The results obtained are as follows 1. The digitizing of one image requires less than 2ses. 2. It can give detailed information on crater wear with limited times and errors 3. All parameters required by specification are easily obtained for several points of the cutting edge.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1998년도 춘계학술대회 논문집
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• pp.143-147
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• 1998

As the accuracy of manufactured goods needed high-accuracy processing has made the efficiency of NC and measurment technology develop, the innovation of machine tools has influence the development of the semi-conductor and optical technology. We can mention that a traction role of the acceleration for the development like that depends on the development of the measurement technics - Stylus instrument method, STM, SEM, Laser interferometer method - which are used for measuring the movement accuracy of machine tools. The movement error factors in movement accuracy are expressed as yaw, roll, and pitch etc. Machining center has 21 movement error factors including of 3 axies joint errors because that has 3 axies and has been measured as the standard of the unloaded condition until now inspite of getting static, dynamic, and servo-gain errors in the case of expending the error range. Therefore, this study tries to measure position accuracy according to loading on the X-Y table of the machining center.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1991년도 추계학술대회 논문집
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• pp.116-120
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• 1991

Technique of length measurement error is widely used in the accuracy assessment of CMMS(Coordinate measuring machines) and machine tools, as it is simple and direct measurement within the working volume of a machine. In this paper, a new method is proposed for the evaluation of the length measurement error in relation to the volumetric accuracy. lD, 2D, and 3D measuring lines are considered for recpective length measurement error: 1D, 2D, and 3D length measurement uncertainties are evaluated from volumetric accuracy. The relationship between the volumetric accuracy md length measurement error to is discussed. PC based system for length measurement error evaluation and simulation is developed.

• 한국정밀공학회지
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• 제27권3호
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• pp.27-32
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• 2010

The OMM(On-Machine-Measurement) system has many advantages compare to conventional measurement in the way the time and cost. But, the sensor suitable to OMM system is restrictive use. Touch trigger probe sensor has long time for measurement and non-contact sensor has directional demerit. Because the long mechanical parts such as gear and lead screw for pump, injector and machine tools has big and heavy, unclamp and transferring for measurement in machining process is very difficult. This paper presents a development of ultra miniature eddy current displacement sensor with 3 axes for On-Machine-Measurement system. The accuracy of the sensor is experimentally proved in the grinding machine. In experimental results, the accuracy has under ${\pm}5\;{\mu}m$.

• 한국정밀공학회지
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• 제18권7호
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• pp.98-105
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• 2001

The machining accuracy is affected by geometric, volumetric errors of the machine tools. To improve the product quality, we need to enhance the machining accuracy of the machine tools. To this point of view, measurement and inspection of finished part as error analysis of machine tools ahas been studied for last several decades. This paper suggests the enhancement method of machining accuracy for precision machining of high quality metal reflection mirror or optics lens, etc. In this paper, we study 1) the compensation of linear pitch error with NC controller compensation function using laser interferometer measurement, 2) the method for enhancing the accuracy of NC milling machining by modeling and compensation of volumetric error, 3) the spherical surface manufacturing by modeling and compensation of volumetric error of the machine tool, 4) the system development of OMM without detaching work piece from a bed of machine tool after working, 5) the generation of the finished part profile by OMM. Furthermore, the output of OMM is compared with that of CMM, and verified the feasibility of the measurement system.

• 대한지역사회영양학회지
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• 제26권2호
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• pp.77-92
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• 2021

Objectives: Food literacy (FL) can be an important concept that embodies the nutritional capabilities of individuals. The purpose of this study was to introduce the definition and core elements of FL from previous literature, to summarize measurement tools and intervention programs with FL, and to suggest the direction of future research and programs to integrate the concept of FL. Methods: The literature review was conducted through PubMed and Google Scholar databases by combining the search term 'food literacy' with 'definition', 'measurement', 'questionnaire', 'intervention', and 'program'. Among the 94 papers primarily reviewed 31 manuscripts that suited the purpose of the study were used for analyses. Results: There is no consensus on the definition of FL that encompasses the multidimensional aspects of the concept. The definitions of FL were slightly different depending on the authors, and the interpretation of the core elements also varied. Based on the review, we propose a framework of FL that is in line with the current discussion among international researchers. This focuses on the core elements adapted from health literacy, namely functional, interactive, and critical FL. Specifically, we suggest some detailed elements for interactive and critical FL, which were often the subject of divergent views among researchers in previous literature. We found that most of the tools in the reviewed literature provided information on validity and reliability and were developed for a specific target population. Also, most of the tools were focused on functional FL. Similarly, most of the interventions targeted functional FL. Conclusions: This study reviewed the definition and core elements of FL, available measurement tools, and intervention programs using validated tools. We propose the development of tools with sound reliability and validity that encompass the three core elements of FL for different age groups. This will help to understand whether improving food literacy can translate into better nutritional intake and health status among individuals and communities.

• 한국정밀공학회지
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• 제15권1호
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• pp.69-77
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• 1998

Linear displacement accuracy is one of the most important factors that determine machine tool accuracy The laser interferometer has been usually recommended for the measurement of linear displacement accuracy. In this paper, microcomputer aided measurement and compensation system has been developed for the pitch error in a CNC machine tool. For accurate pitch error calculation. the analysis code for the pitch error has been also implemented according to the international standards (ISO). The PC based automatic compensation system for the pitch error is also implemented. A new algorithm for calculating optimum value for pitch error compensation is proposed, minimizing the deviation at each target points. The development system has been applied to a practical CNC maching center and the performance has been demonstrated.

• Current Optics and Photonics
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• 제8권4호
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• pp.327-344
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• 2024

Optical phantoms are essential in optical imaging and measurement instruments for performance evaluation, calibration, and quality control. They enable precise measurement of image resolution, accuracy, sensitivity, and contrast, which are crucial for both research and clinical diagnostics. This paper reviews the recent advancements and challenges in phantoms for optical coherence tomography, photoacoustic imaging, digital holographic microscopy, optical diffraction tomography, and oximetry tools. We explore the fundamental principles of each technology, the key factors in phantom development, and the evaluation criteria. Additionally, we discuss the application of phantoms used for enhancing optical-image quality. This investigation includes the development of realistic biological and clinical tissue-mimicking phantoms, emphasizing their role in improving the accuracy and reliability of optical imaging and measurement instruments in biomedical and clinical research.