• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.1
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• pp.80-85
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• 2011

This paper presents the design of the power-assisted controller for the in-wheel type smart wheelchair by using torque estimation that is predicted by relationship between input voltage and output wheel angular velocity. Nowadays, interest of the moving assistant aids is increased according to the increase in population of the elderly and the handicapped person. However some of the moving assistant aids have problems. For example, manual wheelchair has difficulty moving at the slope, because users lack the muscular strength of their arm. In electric wheelchair case, users should be weak by being decreased muscles of upper body. To overcome these problems, power-assisted electric wheelchair are proposed. Most of the power-assisted electric wheelchair have the special rims that can measure the user's power. In here, the rims have to be designed to install the sensors to measure user's power. In this paper, we don't design the rim to measure the man power. To predict the man power, we propose a control algorithm of the in-wheeled electric wheelchair by using torque estimation from the wheel. First, we measure the wheel velocity and voltage at the in-wheel electric wheelchair. And then we extract driving will forces by using proposed mathematical model. Also they are applied at the controller as the control input, we verify to be able to control in-wheel type smart wheelchair by using simulation.

• Journal of the Health Care and Life Science
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• v.10 no.2
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• pp.243-252
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• 2022

This study introduces a case consisting of nursing capstone design class delivered in an intensive mode during the COVID-19 pandemic and analyzes the outcome of student capstone designs. The nursing capstone design class was held four hours a week for eight weeks from August 25 to October 27, 2020, and 18 students completed the course. Results of capstone design projects included a storybook designed to educate hospitalized children for their disease, detachable nets for safe wheelchair transfer, teaching aids for pregnant women with gestational diabetes, and adhesive alarm bells for bed rails. Students showed high satisfaction with the intensive mode of delivery in the class and positively evaluated the inclusion of team-based projects, and the average score of overall satisfaction with the course was 4.8±0.41. There is a lack of research on intensive capstone design courses in the nursing field. This study explores measures to help develop flexible cirriculums and enhance learner efficacy in a real-life context. Future research is anticipated to expand on capstone design in nursing.

• Structural Engineering and Mechanics
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• v.11 no.3
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• pp.287-299
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• 2001

Columns in multi-storey frames are presently categorised as either braced or unbraced, usually by means of the stability index criterion, for estimating their effective length ratios by design aids such as 'alignment charts'. This procedure, however, ignores the transition in buckling behaviour between the braced condition and the unbraced one. Hence, this results in either an overestimation or an underestimation of effective length estimates of columns in frames that are in fact 'partially braced'. It is shown in this paper that the transitional behaviour is gradual, and can be approximately modelled by means of a 'fuzzy logic' based technique. The proposed technique is simple and intuitively agreeable. It fills the existing gap between the braced and unbraced conditions in present codal provisions.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2670-2675
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• 2003

A human-friendly interactive system, based on the harmonious symbiotic coexistence of human and robots, is explored. Based on interactive technology paradigm, a robotic cane is proposed for blind or visually impaired travelers to navigate safely and quickly among obstacles and other hazards faced by blind pedestrians. Robotic aids, such as robotic canes, require cooperation between humans and robots. Various methods for implementing the appropriate cooperative recognition, planning, and acting, have been investigated. The issues discussed include the interaction of human and robot, design issues of an interactive robotic cane, and behavior arbitration methodologies for navigation planning.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.457-460
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• 2005

When a hearing aid' s user is listening through telephone or cellular phone, he/she usually suffers from severe electrical magnetic interference noise. It is because hearing aids amplify voice signal as well as background noise. A telecoil, an induction coil, is a possible solution for the problem. Because a telecoil has the characteristic of high pass filter, it has some problem of resulting increased high frequency noise. For solving this problem, we can use a capacitor connected with the telecoil in parallel. According to capacitance, receiving signal quality may change. In this paper, proper capacitor values for the best sound quality are investigated by experimental work.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.235-238
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• 2004

대부분의 보청기 이용자들은 자신이 장애를 겪고 있다는 사실이 알려지는 것을 꺼린다. 따라서 보청기 사용자들은 귀 바깥쪽으로 들어 나지 않는 귓속형(ITE type) 보청기를 선호한다. 하지만, 이러한 귓속형 보청기를 제작하는 것은 쉬운 일이 아니다. 보청기의 각각 부품들만을 볼 때는 그 크기가 소형이지만, 부품 모두를 귀속에 넣는다고 한다면, 공간의 확보는 꼭 필요한 사항이다. 또한 보청기는 하나의 칩(chip)에 부품이 전선(wire)을 통해 납땜이 되는 구조이다. 이는 전선의 단락을 유발할 뿐만 아니라 칩과 전선이 쉽게 떨어지며, 잦은 납Eoa 작업으로 인해 열적으로 칩의 파손까지도 일으킨다. 이를 보안하고자 여기에서는 보청기 소형화 방법으로 PCB(Printed Circuit Board)를 제시하였다. PCB 를 사용함으로써 전선의 사용을 최소화하고, 부품과 PCB 와의 직접적인 결합으로 인해 보다 견고한 보청기 제작을 목표로 하였다. 아울러 PCB 를 통한 부품의 실장으로 기존의 수작업이던 보청기 제작을 자동화와 제작 시간의 단축이라는 이점을 얻을 수 있다.

• Journal of the Korean Institute of Navigation
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• v.18 no.1
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• pp.1-21
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• 1994

The safety of the ship manoeuver is dependent not only on the inherent characteristics of the ship itself and environmental conditions, but also on the skill and experience of the ship operator. As the ship operator's judgement is related to his experience and skill, based on outside information, piloted controllability also depends upon the effectiveness, accuracy and reliability of various information which is obtainable from navigational equipments and aids to navigation that are available to the ship ope-rator. Although these factors, human factors and informational factors, have been pointed out as major factors which affect the controllability of a ship, there was no a comprehensive examination on the effect of these two factors. In this thesis, therefore, an attempt was made to examine whether or not there is clear indication that these two factors affect the controllability of a ship in reality. Experiments were conducted using the port design simulator of the Korea Maritime University.

• Journal of the Korean housing association
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• v.14 no.3
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• pp.41-49
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• 2003

An evaluation of the environments in the wandering pathway of the dementia units was carried out. It is revealed that the quality of the environment for the wandering pathway of the sample units was very low. In particular, lacks of social environments in Unit-B and Unit-C, and lacks of orientation aids in all the sample units were shown. Therefore, re-design for the wandering pathway of the sample units is needed. Recommendations for improving the wandering pathway and having appropriate wandering pathway without any abrupt change in existing layout of the sample units were suggested, and the limits of this research is diagnosed. It is also shown that since evaluation categories used in this paper had very closed relationship each other, those evaluation categories can be used in other settings.

• Journal of Korean Library and Information Science Society
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• v.32 no.2
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• pp.165-185
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• 2001

This study measured whether web-based library user education represent web-based instruction theories in education. 9 criteria used were course-related instruction, collaborative learning, evaluation of tutorials, education of information retrieval, contents tables, multimedia interaction between users and librarians, navigational aids, variation of menus. The result showed that both contents and design of web sites were important for good web-based library user education.

• Journal of the Korean Institute of Intelligent Systems
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• v.14 no.5
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• pp.635-641
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• 2004

A human-friendly interactive system that is based on the harmonious symbiotic coexistence of human and robots is explored. Based on interactive technology paradigm, a robotic cane is proposed for blind or visually impaired travelers to navigate safely and quickly through obstacles and other hazards faced by blind pedestrians. Robotic aids, such as robotic canes, require cooperation between human and robots. Various methods for implementing the appropriate cooperative recognition, planning, and acting, have been investigated. The issues discussed include the interaction of human and robot, design issues of an interactive robotic cane, and behavior arbitration methodologies for navigation planning.