• Journal of Digital Convergence
• /
• v.11 no.1
• /
• pp.389-394
• /
• 2013

The purpose of this study was to investigate the effects of combined exercise program on fall-related physical fitness and pain response in elderly people. Fall-related physical fitness consisted of the 7 performance test items by Senior Fitness Test Manual. Pain response was measured by visual analog scale (VAS sore: 0=no pain, 10=extremely unsatisfactory). The combined exercise program was performed for about one hour per day, 4 times a week over a period of 10 weeks. As the result of this study, flexibility, agility, and right balance were significantly increased. The various characteristics of pain were considerably improved on pain symptom, leg pain when walking, pain symptom when sitting, and pain symptom in daily living. In conclusion, there has been a substantial improvement in 10 weeks by combined exercise program.

• Journal of Electrical Engineering and Technology
• /
• v.13 no.3
• /
• pp.1392-1397
• /
• 2018

The potentiometric measurement result for a high resistance up to $100P{\Omega}$ using a low resistance, a low voltage source and a commercial digital multimeter(DMM) is presented. With the method, a resistance can be easily, fast and economically measured. Using the method, resistance ranges over the $10G{\Omega}$ range which is difficult to measure using a commercial DMM and resistance ranges between $100T{\Omega}$ and $100P{\Omega}$ which cannot measure using an insulation tester were measured within accuracy of a few percent. It is expected that it can be useful to determine the temperature and voltage effect of a high resistance and an insulation material because it uses a reference resistance with a low resistance, very low temperature and voltage effect. Besides, it is expected that it can be useful to calibrate a dc high voltage divider with a large resistance ratio and a very low resistance because arbitrary resistance ratio measurements are possible with it.

• Journal of Digital Convergence
• /
• v.18 no.12
• /
• pp.97-103
• /
• 2020

The proposed system is composed of two parts, an AI physical fitness measurement part and an AI physical fitness management part. In the AI fitness measurement part, a guide to physical fitness measurement and accurate calculation of the measured value are performed through deep learning-based pose recognition. Based on these measurements, the AI fitness management part designs personalized exercise programs and provides them to dedicated smart applications. To guide the measurement posture, the posture of the subject to be measured is photographed through a webcam and the skeleton line is extracted. Next, the skeletal line of the learned preparation posture is compared with the extracted skeletal line to determine whether or not it is normal, and voice guidance is provided to maintain the normal posture.

• 제어로봇시스템학회:학술대회논문집
• /
• 1991.10b
• /
• pp.1671-1676
• /
• 1991

Direct digital design of computed torque controllers for a robot manipulator is discussed in this paper. A simple discrete-time model of the robot manipulator obtained by Euler's method is used for the design. Taking account of computation delay in the digital processor, we propose predictor-based designs of the PD and PID type controllers. The PID type controller is designed based on a modified version of the discrete-time integral controller proposed by Mita. For both controllers, the same formulas can be used to determine the feedback gains. A simulation example is presented to compare the robustness of the proposed controllers against physical parameter variations.

• Korean Management Science Review
• /
• v.21 no.3
• /
• pp.1-12
• /
• 2004

The paper demonstrates that versioning of digital products occurs more frequently than that of physical products because of low marginal cost. The versioning occurs no matter what a customer knows his/her reservation price. Low-quality version will not be produced when the difference between reservation prices is very large. The paper also shows that a firm tries to lower the quality of low-quality product to prevent customers with high reservation prices from purchasing low-quality product.

• Journal of Electrical Engineering and information Science
• /
• v.3 no.2
• /
• pp.139-144
• /
• 1998

This paper describes the design of a variable rate QPSK demodulator for digital satellite TV system. This true variable-rate demodulator employs a unique architecture to realize an all digital synchronization and detection algorithm. Data-flow based design approach enabled a seamless transition from high level design optimization to physical layout. The demodulator has been integrated with Viterbi decoder, de-interleaver, and Ree-Solomon decoder to make a single chip Digital Video Broadcast (DVB) receiver. The receiver IC has been fabricated with a 0.5mm CMOS TLM process and proved fully functional in a real-world set-up.

• Korean Institute of Interior Design Journal
• /
• v.16 no.5
• /
• pp.126-133
• /
• 2007

This study is intended to set the concept of becoming meaning of digital space through digital technology and to study the influence of digital space on becoming of real space through derived keyword. The results of this study are summarized as follows. First, the digital concept is created in the process that the virtual space is changed into the real space with a priority given to form, space and time. Digital expression concept and image concept the structural becoming, and idea concept and creative concept creates the time becoming. Second, the concept of digital becoming exposes a physical visibility through the digital's virtual image, and non-space spatiality through the space simulation. It also continuously reveals a consecutive time and non-consecutive time through a statable progress, incremental progress, and dynamic progress. Third, as the influence of digital on becoming of real space, the digital visibly not only expresses the new and difficult becoming problem through conceptual virtuality, but also can review the real space's space concept with virtuality in the digital non-area. Digital's durability expresses the new space's existence by physically combining with the existing space through the virtual form creation.

• Journal of the Korea Society for Simulation
• /
• v.29 no.2
• /
• pp.11-20
• /
• 2020

As the manufacturing environment becomes more complex, traditional simulation models alone are having a lot of difficulties in reflecting real-time manufacturing situations. Although the Digital Twin concept is actively discussed as an alternative to overcome theses issues, many studies are being carried out only in the product design phase. This research presents a Digital Twin-based manufacturing environment framework for applying the Digital Twin concept to the manufacturing process. Twin model that is operated in virtual space, physical system and databases describing the actual manufacturing environment, are proposed as detailed components that make up the framework. To check the applicability of proposed framework, a simple Digital Twin-based manufacturing system was simulated in a conveyor system using Arena software and Excel VBA. Experiment results have shown that the twin model is transmitted real time data from the physical system via DB and were operating in the same time unit. The Excel VBA fitted parameters defined by cycle time based on historical data that real-time and training data are being accumulated together. This study proposes operating method of digital twin model through the simple experiment examples. The results lead to the applicability of Digital twin model.

• Journal of Digital Convergence
• /
• v.12 no.8
• /
• pp.389-396
• /
• 2014

This study was conducted to analyze the satisfaction level that students in physical therapy departments have with their major after they enter college; it also aimed to present the factors that affect that satisfaction. With regard to satisfaction in relation to general characteristics, no significant difference in satisfaction was shown between the two genders or among the times of selection of the department. Significant differences in satisfaction with the department were found for high school courses, school systems, grades, and the influences on the selection of the department. The variables that significantly affected satisfaction with the department were: satisfaction with perception, satisfaction with curricula, general satisfaction, and satisfaction with relationships. In particular, satisfaction with perception showed the highest standardized regression coefficient value for satisfaction with the department. Based on the results of this study, to enhance the satisfaction levels of students in physical therapy departments, interest in physical therapy should be drawn from the students based on social perception and high level educational environments, and the relationship between the processors and the students should be improved.

• Journal of Digital Convergence
• /
• v.12 no.6
• /
• pp.645-653
• /
• 2014

Purpose of this study was to reveal the relationship between Cultural physical Education's Enjoyment Factor and Happiness, social physique anxiety via structural equation model. For the research object of this study 380 students, taking a cultural physical education class in Kyungki-Incheon district, have been selected. Statistics processing was carried out through PASW 18.0 and AMOS 18.0. The following results were obtained by analysis of frequency, confirmatory factor analysis, correlation analysis, structural equation model analysis to serve it's purpose. First, perceived enjoyment factor of cultural physical education student had positive(+) correlation with happiness. Sencond, perceived happiness of cultural physical education student had negative(-) correlation with social physique anxiety. Third, cultural physical education student's happiness has mediating effects as a buffer between class enjoyment factor and social physique anxiety.