• International journal of advanced smart convergence
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• 제11권3호
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• pp.197-205
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• 2022

In order to investigate the effect of an 8-week elastic band exercise program according to age on the isokinetic strength and dynamic equilibrium of the knee, 10 women under 49 years old and 10 women over 50 years old were selected. Dynamic equilibrium was measured through Y-Balance test one week before the exercise program, and power and endurance were confirmed by measuring isokinetic muscle strength of the knee. After measurement, small tool exercise was performed for 8 weeks. After 8 weeks of exercise, isokinetic muscle strength and dynamic equilibrium were measured. As a result, isokinetic muscle strength, which checks muscle strength and muscular endurance, increased after measurement than before measurement regardless of age, and dynamic equilibrium increased after measurement rather than before measurement, and the group under 49 years of age was higher than the group over 50 years old. We think that small tool exercise improves isokinetic muscle strength and is effective in neuromuscular development, improving dynamic stability ability, which is an important factor in preventing falls.

• 한국정밀공학회지
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• 제16권9호
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• pp.62-67
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• 1999

In milling, cutting tool ins directly attached to spindle and this tells that spindle can provide very useful information on the cutting tool condition such as wear or breakage. Since spindle is rotating at a high speed, measuring spindle velocity using a noncontacting measurement system gives the best information which can be obtained. Due to the force applied to spindle through cutting tool, velocity of spindle changes. And any change in cutting tool condition affects cutting force and consequently spindle vibration. With the intent of continuously monitoring cutting tool condition in intermittent machining operations in a benign manner, a noncontacting velocity measurement system using a laser Doppler velocimeter was assembled to measure spindle torsional vibration. Spindle vibration was measured and analysis of it in the frequency domain yielded a measure which corresponded to amount of cutting tool wear in milling.

• 대한기계학회논문집A
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• 제25권9호
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• pp.1359-1367
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• 2001

Improvement of machine tool accuracy is an essential part of quality control in manufacturing process. Among of all the errors of a particular machine tool, the thermal errors of the spindle have a notably significant effect on machining accuracy and have a direct influence upon both the surface finish and geometric shape of the finished workpiece. Therefore, this paper proposed new measurement method for thermal errors of the spindle in machine tools. The thermal errors are measured by a ball bar system instead of capacitance sensor system. The novel measurement method using ball bar system is more efficient, easier to use than conventional measurement system. And also the ball bar system is possible to measure both geometric errors and thermal errors at the same time.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 춘계학술대회논문집
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• pp.899-902
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• 2002

Effect of hand-transmitted vibration on human discomfort and health was reviewed. Since the effect by hand tool was more serious than those by any other vibration environments, western countries have protected hand tool workers by regulations. International organization for standardization legislate standard, ISO 5349, at 1979 for the measurement and evaluation of the effect. Afterwards, more than twenty standards on hand-arm vibration were enacted to Protect any damage of hand tool users. Even though Korea Standards adopted ISO 5349 in 2001, it is required an action plan should be applied to all of work environments, especially to the workers using pneumatic tool workwers such as miners, construction workers, and etc.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.455-458
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• 2003

Effect of hand-transmitted vibration on human discomfort and health was reviewed. Since the effect by hand tool was more serious than those by any other vibration environments, western countries have protected hand tool workers by regulations. International organization for standardization legislate standard, ISO 5349, at 1979 for the measurement and evaluation of the effect. Afterwards, more than twenty standards on hand-arm vibration were enacted to protect any damage of hand tool users. Even though Korea Standards adopted ISO 5349 in 2001, it is required an action plan should be applied to all of work environments, especially to the workers using pneumatic tool workers such as miners, construction workers, and etc.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 추계학술대회 논문집
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• pp.225-228
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• 2009

The simulated indoor pass-by noise measurement system is the tool to measure and evaluate the pass-by noise at the test laboratory, without doing measurement at the field. This measurement system can realize the precision measurement under the specific condition and overcome the limitations of the field measurement, i.e. weather conditions, repeatability, .. This measurement system is done in time domain process using the array techniques, which synchronizes the time signals. The reliability of the obtained result depends on the array shapes, which can generate the moving source effect. In this paper, the validations are checked focusing the time domain synchronization of the signals with the optimum microphone array shape.

• 한국정밀공학회지
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• 제10권4호
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• pp.94-103
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• 1993

In this work, the imaginary part of the inner modulation transfer function of the cutting dynamics is introduced for tool wear monitoring. Time-series method is utilized to construct the general three dimensional cutting dynamics whose imaginary part of the inner modulation transfer funcition shows the proportionality to tool wear at the natural frequency of the machine tool dynamics. Thus model is reduced to single-input single-output model without altering the proportionality characteristics to tool wear and implemented to the dual computer system in which one computer performs measurement while the other calculates the imaginary part of the inner modulation transfer function of the cutting dynamics by the batch least square method. The values of the imaginary part at the natural requency of the machine tool structure in the cutting direction are compared to the one calculated during machining with a brand new tool to decide the current status of the tool. The experiments shows the relevance of the proposed concept.

• 디지털융복합연구
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• 제16권8호
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• pp.381-391
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• 2018

이 연구는 스포츠윤리교육 프로그램에 대한 교육만족도 측정도구를 개발하고 그 타당성을 검증하는 데 목적이 있다. 연구의 목적을 달성하기 위하여 연구절차는 다음과 같이 3단계로 이루어졌다. 1단계에서는 스포츠윤리교육 프로그램과 관련된 선행연구를 분석하고, 개방형 질문지를 통해 얻어진 응답 결과를 토대로 예비문항을 구성하였다. 2단계는 예비조사단계로서 1단계에서 진행된 측정도구의 탐색적 요인분석과 확인적 요인분석을 통해 구인타당성을 확보하였다. 3단계는 본 조사 단계로서 차이 검증을 통해 측정도구의 외적타당도를 확보하였으며, 이를 통해 도출된 내용을 중심으로 교육만족도측정을 위한 문항을 구성하였다. 그 결과 교육내용 6문항, 강사역량 5문항, 교육효과 6문항, 총 3개 영역 17개 문항으로 스포츠윤리교육 프로그램의 교육만족도 측정도구가 개발되었다. 이 연구는 실효성 있는 스포츠윤리교육 프로그램 개발을 위한 기초자료로 활용될 수 있으며, 이를 통해 윤리적인 소양을 지닌 스포츠선수로 성장할 수 있는 기반이 마련됨으로써 궁극적으로 스포츠계의 변화와 발전에 기여할 수 있기를 기대한다.

• International Journal of Quality Innovation
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• 제9권2호
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• pp.11-30
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• 2008

The purpose of this study is to develop BSC model of social enterprise. Performance analysis tool of BSC have been brought over from the business world, designed and created from the perspectives of profit-based businesses. The BSC is a strategic performance measurement and management tool designed for the private sector acting as a communication/information and learning system, to measure 'where we are now' and 'where to aim for next'. It prescribes a plan for translating 'vision' and 'strategy' into concrete action across four perspectives at different stages, depending on the business. These perspectives are 'financial', 'customer', 'internal processes' and 'learning and growth', each of which is connected by cause-and-effect relationships that reflect the firm's strategy. Social aims of social enterprise are to accomplish desired outcomes which are to employ vulnerable people and to provide social services. The measurement factors of financial perspective are stable funding, efficiency of budgeting, stakeholders' financial supports, and trade profit. The measurement factors of customer perspective are government, social service users, employees, local communities, sup plier, social activity company, and partnership with external organizations. The measurement factors of internal process perspective are organizational culture, organizational structure/management, internal/external communication, quality of products and services, information sharing. The measurement factors of learning and growth perspective are training and development, management participation, knowledge sharing, leadership of CEO and manager, and learning culture.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 추계학술대회논문집 - 한국공작기계학회
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• pp.304-308
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• 2000

Surface roughness measurement system with capacitance type gap sensor. Tentative result from the calibration measurement showed the potential applicability of the sensor to the processed specimen. In order to test the sensitivity of the measurement system, several parameters including valley depth, width of the specimen have been changed. Effect of the charge area between sensor and specimen surface has been also analyzed.