• 재활복지
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• v.21 no.1
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• pp.253-277
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• 2017

The purpose of this study was to develop the Constraints in Physical Activity Scale for people with physical Disabilities(CPASD) which measures the constraints in physical activity of people with physical disabilities. For this study, the 5 step analytic framework of unified validity developed by Messick (1995), the framework for conducting a strong program of construct validation by Benson (1998) method were applied. Furthermore, the validity of CPASD was systematically presented by applying common factor model and measurement model to 264 persons with physical disabilities. The conclusion based on the results and discussions of this study is as follows. First, CPASD presented evidence of job validity. Four factors (17 items) were developed, consisting of leader constraints, economic constraints, prejudice, and exercise environment constraints through the analysis of the factor structure and the fit of factor coefficients. Second, the factor structure of the developed CPASD (leader constraint, economic constraint, prejudice, exercise environment constraint) was statistically distinguished and stably reflected the existing exercise participation constraints theory. Third, the developed CPASD presented evidence of the validity of the criteria. Leader constraints and prejudice were negatively correlated with positive motor emotions, leader constraints, prejudice, and exercise environment constraints were positively correlated with negative motor emotions. Therefore, in future research, it is necessary to reevaluate the current system and actual condition related to leader constraints, economic constraints, prejudices, and exercise environment constraints derived as factors of CPASD. To do this, it is necessary to judge the degree of reality based on the causal relationship verification and IRT theory using CPASD.

• Journal of Power Electronics
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• v.18 no.4
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• pp.1111-1126
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• 2018

In modern power systems, distributed generators (DGs) result in high stress on system frequency stability. Apart from the intermittent nature of DGs, most DGs do not contribute inertia or damping to systems. As a result, a new control method referred to as a virtual synchronous machine (VSM) has been proposed, which brought new characteristics to inverters such as synchronous machines (SM). DGs employing an energy storage system (ESS) provide inertia and damping through VSM control. Meanwhile, energy storage presents some physical constraints in the VSM implementation level. In this paper, a VSM mathematical model is built and analyzed. The dynamic responses of the output active power are presented when a step change in the frequency occurs. The influences of the inertia constant, damping factor and operating point on the ESS volume margins are investigated. In addition, physical constraints are proposed based on these analyses. The proposed physical constraints are simulated using PSCAD/EMTDC software and tested through RTDS experiment. Both simulation and RTDS test results verify the analysis.

• Korean Journal of Human Ecology
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• v.18 no.3
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• pp.689-703
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• 2009

The purpose of this study is to investigate the relationships among 'leisure constraints', 'leisure sufficiency' and 'life satisfaction' perceived by late middle-aged adults. The subjects of this research were 275 adults from 50 to 64. The results are as follows: 1) Among 5 categories of 'leisure constraints', the subjects perceive' financial constraints' as the most important, and in order of importance, 'social constraints', 'physical constraints', and 'familial constraints' followed. 2) Among five 'leisure activities', a factor perceived most sufficiently by middle-aged adults is 'simple relaxation' and followed by 'social activities', 'activities with family'. 'learning activities', and 'play-recreation activities'. 3) The factors influencing life satisfaction perceived by late-middle aged adults are 'religion', 'financial constraints', 'education', 'familial constraints', 'physical constraints', 'learning activities', and 'play-recreation activities'. These 7 factors explain 38.9% of total variation. Also, the 'leisure constraints' has a greater impact on their 'life satisfaction' than on their 'leisure sufficiency'.

• The Journal of the Korea Contents Association
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• v.12 no.6
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• pp.466-474
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• 2012

This study aims at looking into constraints of physical activity amid "after school" programs operated by an elementary school of Incheon City. For this study, 330 elementary school students of Incheon City were sampled, and tested of descriptive statistics, explanatory factor analysis, Cronbach's alpha, One-way ANOVA, independent t-test, and confirmatory factor analysis by Raymore, Godbey, Crawford's questionnaire. First, examining difference of constraints in accordance with the demographic variables of physical activity participants. Second, analyzing probing and confirmative factors and reliance of leisure constraints for physical activity participants. Third, examining the relations of cause and effect between factors of leisure constraints of physical activity participants and participation.

• Journal of Digital Convergence
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• v.15 no.11
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• pp.567-579
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• 2017

The purpose of this study was conducted to clarify physical activity university students on time perspective in leisure constraints and leisure flow. To achieve this purpose, subjects of this study were sampled 295 Physical Activity University Students participant using purposeful sampling method for 2 months from May to June of 2017. Using questionnaires stratified cluster random sampling in university students in D city and C city. The analysis method was used t-test, one-way ANOVA, multiple regression analysis, correlation analysis methods in order to solve problems of the study. According to the study Result, First, studies show that female have high levels of leisure constraints than males. Males have higher levels of leisure flow than females. The first grader show high level of individual constraints and past negation were also high. In the series of majors, natural affiliates and humanities are high in the past negation, present destiny, the service major currently high in pleasure and of leisure, autotelic experience of leisure flow. In the rhythmic type of Activity type, the past negation, present destiny and leisure constraints are highly likely to be higher. In the competitive have shown that is high. Second, leisure constraints on students' participation in physical activities have been found to have negative influence on their students. Third, leisure flow have shown that they have a positive effect on past affirmation and present pleasure.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.3
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• pp.55-67
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• 2009

This paper addresses the dynamic consideration of the athletic constraints on skating motion. In order to generate a human-like skating motion, the athletic constraints are distinctively analyzed into dynamic constraints and physical constraints. A close investigation of the athletic constraints evolved valid extent of dominant parameter for a leg muscle. During the human-like skating motion, the state of actuation was shifted from region of maximum force to region of maximum power. Simulation results were intuitively comprehensible, and the effectiveness of analytic algorithm was demonstrated for skating motion.

• The Bulletin of The Korean Astronomical Society
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• v.38 no.2
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• pp.35.2-35.2
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• 2013

I will present a new approach to constrain galaxy physical parameters from the combined interpretation of stellar and nebular emission in wide ranges of observations. This approach relies on a comprehensive library of synthetic spectra, assembled using state-of-the-art models of star formation and chemical enrichment histories, stellar population synthesis, nebular emission and attenuation by dust. We focus on the constraints set by 5-band photometry and low- and medium-resolution spectroscopy at optical rest wavelengths on a few physical parameters characterizing the stars and interstellar medium. Since these parameters cannot be known a priori for any galaxy sample, we assess the accuracy to which they can be retrieved by simulating 'pseudo-observations' using models with known parameters. We find that the combined analysis of stellar and nebular emission in low-resolution (50A FWHM) galaxy spectra provides valuable constraints on all physical parameters. The approach can be extended to the analysis of any type of observation and during this talk i will present some applications to observed galaxies up to redshift 1.5.

• The Journal of Korean Physical Therapy
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• v.12 no.3
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• pp.433-444
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• 2000

The purpose is paper was to discuss current concepts related to anatomic stabilizing structures of the shoulder joint complex and their clinical relevance to shoulder instability. The clinical syndrome of shoulder instability represents a wide spectrum of symtoms and signs which may produce various levels of dysfunctions, from subtle subluxations to gross joint instability. The glenohumeral joint attains functional stability through a delicate and intricate interaction between the passive and active stabilizing structures. The passive constraints include the bony geometry, glenoid labrum, and the glenohumeral joint capsuloligaments structure. Conversely, the active constraints, also referred to as active mechanism, include the shoulder complex musculature, the projprioceptive system, and the musculoligamentous relationship. The interaction of the active and passive mechanism which provide passive and active glenohumeral joint stability will be throughtly discussed in this paper

• The Transactions of The Korean Institute of Electrical Engineers
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• v.68 no.1
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• pp.145-152
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• 2019

A composite guidance scheme is proposed for air-to-ground anti-tank missiles launched from an airborne platform. Long-range anti-tank missiles usually use a fiber optic line (FOL) for the datalink between an operator and the missile to obtain real-time target information and to command the missile. Also, impact angle control is used to maximize the warhead effectiveness, but it should be carefully implemented due to interference between the launch platform and the FOL. Thus, the proposed guidance scheme takes into account both impact angle and FOL constraints. Under system lag and acceleration limits, a selection method of guidance gains and calculation logic of the maximum achievable impact angle are proposed for a guideline of practical implementation. The performance of the proposed guidance scheme is investigated by nonlinear simulations with various engagement conditions.

• 한국체육학회지인문사회과학편
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• v.55 no.1
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• pp.579-588
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• 2016

The purpose of this study was to analyze Structural relations among leisure facilitators, leisure constraints negotiation, and serious leisure for winter sports participants In order to achieve the purpose of this study, total 320 data were collected who are participating in winter sports at 4 Ski resorts located in Gyeonggi and Gangwon area. The collected data analysis were conducted using SPSS 21.0 and Amos 18.o and its result is as follows; First, through the model-fit validation regarding hypothetical model of leisure facilitators, leisure constraints negotiation and serious leisure, the model-fit was satisfied the standard. Second, leisure facilitators showed no significant effect on both leisure constrains negotiation and serious leisure but leisure constraints negotiation showed significant effect on serious leisure. After validation, all suggested hypotheses were selected. Leisure facilitators showed positive effect on continuous participation on planned, strived serious leisure by encouraging leisure participants and boosted constraints negotiation effort that eliminates negative situation which caused by physical, conscious strategic leisure participation overcoming restricting factors.