• Earthquakes and Structures
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• 제4권1호
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• pp.85-108
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• 2013

The research presented in this paper deals with the seismic protection of existing frame structures by means of passive energy dissipation. A displacement-based procedure to design dissipative bracings for the seismic protection of frame structures is proposed and some applications are discussed. The procedure is based on the displacement based design using the capacity spectrum method, no dynamic non linear analyses are needed. Two performance objective have been considered developing the procedure: protect the structure against structural damage or collapse and avoid non-structural damage as well as excessive base shear. The compliance is obtained dimensioning dissipative braces to limit global displacements and interstorey drifts. Reference is made to BRB braces, but the procedure can easily be extended to any typology of dissipative brace. The procedure has been validated through a comparison with nonlinear dynamic response of two 2D r.c. frames, one bare and one infilled. Finally a real application, on an existing 3D building where dissipative braces available on market are used, is discussed.

• Journal of Power Electronics
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• 제10권5호
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• pp.563-571
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• 2010

A model of an advanced aircraft electric power system is developed and studied under variable-speed constant-frequency (VSCF) operation. The frequency of the generator's output voltage is varied from 400-Hz to 800-Hz for different loading scenarios. Power conversions are obtained using 12-pulse power converters. To reduce the harmonic contents of the generator output waveforms, two high-pass passive filters are designed and installed one at a time at the generator terminals. The performance of the two passive filters is compared according to their losses and effectiveness. The power quality characteristics of the studied VSCF aircraft electric power system are presented and the effectiveness of the proposed filter is demonstrated through compliance with the newly published aircraft electrical standards MIL-STD-704F.

• 한국간호교육학회지
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• 제26권2호
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• pp.176-184
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• 2020

Purpose: We explored emergency nurses' experiences of coping with moral distress. Methods: A qualitative research design was used. We conducted in-depth interviews with 11 nurses working at a regional emergency medical center in South Korea. Data were analyzed using conventional content analysis. Results: The main theme of nurses' coping with moral distress was "a passive emotion-based response." We also extracted three categories of coping strategies: "uncritical adaptation to anguished situation," "self-justification for not acting," and "flight from ethical decision making." Conclusion: Nurses coped with moral distress in a passive and emotional way, possibly because of perceived incompetence and compliance to an organizational hierarchy. The findings imply that effective approaches to addressing moral distress in emergency nurses are needed at the individual and organizational levels.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.119.2-119
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• 2002

In this paper a passive compliant joint (PCJ) for human-friendly service robots is presented. The PCJ is composed of a magneto-rheological damper and a spring for elasticity. In the magneto-rheological damper, a braking force proportional to the electric current is generated. It works as a viscous damper by controlling the electric current according to the angular velocity of spring displacement. The compliance property and position control of the PCJ are verified through experiments and simulations to a single DOF simple arm with the PCJ.

• Advances in robotics research
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• 제1권1호
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• pp.21-39
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• 2014

Due to the rapid progress in the field of robotics, it is a high time to concentrate on the development of a robot that can manoeuvre in all type of landscapes, ascend and descend stairs and sloping surfaces autonomously. This paper presents details of a prototype robot which can navigate in very rough terrain, ascend and descend staircase as well as sloping surface and cross ditches. The robot is made up of six differentially steered wheels and some passive mechanism, making it suitable to cross long ditches and landscape undulation. Static stability of the developed robot have been carried out analytically and navigation capability of the robot is observed through simulation in different environment, separately. Description of embedded system of the robot has also been presented and experimental validation has been made along with some details on obstacle avoidance. Finally the limitations of the robot have been explored with their possible reasons.

• 한국산학기술학회논문지
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• 제13권12호
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• pp.5867-5874
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• 2012

본 연구의 목적은 뇌졸중 환자에서 주관절 각도 변화에 따른 상완이두근(biceps brachii)의 근구조 및 탄성 변화에 관하여 알아보고자 하였다. 연구대상은 주관절 수동 ROM범위가 $10^{\circ}{\sim}90^{\circ}$ 가능하며 MAS(modified Ashworth scale) 1~3등급인 뇌졸중 환자 12명을 대상으로 하였다. 이완(resting) 상태의 건측과 환측 상완이두근의 우모각, 근섬유속길이, 근탄성의 측정은 초음파 영상 촬영장치와 근긴장도 측정기(myotonometer)를 이용하여 주관절을 $10^{\circ}{\sim}90^{\circ}$로 변화시키면서 측정하였다. 본 연구 결과, 환측 상완이두근을 건측과 비교 시 우모각은 신전위치($<40^{\circ}$)에서 큰 값을 나타냈으며(p<.05), 근섬유속길이는 굴곡위치($>20^{\circ}$)에서 짧은 길이를 나타냈으며(p<.05), 근긴장은 신전위치($<50^{\circ}$)에서 전위 값이 낮게 나타나 근긴장이 높아짐을 나타냈다(p<.05). 이렇듯 이완 시 상완이두근의 근구조 및 탄성은 주관절 각도에 의해 영향을 받는다는 것을 알 수 있었다. 본 결과를 뇌졸중 환자의 근구조 변화 및 임상치료의 연구 자료로 사용할 수 있을 것으로 생각된다.

• 대한족부족관절학회지
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• 제14권2호
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• pp.146-150
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• 2010

Purpose: Pilon fracture has several serious complications such as joint stiffness, arthrosis and delayed angular deformity. We report short-term results of new treatment modality using distracted dynamic external fixators and early controlled ankle motion. Materials and Methods: Eight cases of severe pilon fractures for which we tried small plate fixation and additional distracted dynamic external fixators from July 2007 to June 2009 were included. Half passive continuous ankle joint motion was allowed under free hinged ring fixators after the operation. The external fixators were removed after two or three months from the surgery. We investigated joint space by radiograph, joint pain, range of motion, patient's satisfaction of treatment protocol. Results: Joints were distracted when external fixators were applied and mean 28% of space loss developed after removal of external fixators. In most of cases, satisfactory alignments were maintained. Regarding range of joint motion, mean dorsiflexion angle was 15 degrees and mean plantarflexion angle was 32 degree in the condition of wearing external fixators. There was mean 8% reduction of range of motion but no further progression of ankle stiffness after removal of external fixators. Dorsiflexion was not improved after that, but plantarflexion angle was improved 10% even after removal of external fixators. Patients were generally in compliance with the treatment protocols with high level of satisfaction. Conclusion: We got good results with distracted dynamic external fixators and early continuous half-passive joint motion for pilon fractures in terms of joint pain and range of motion. Therefore we suggest this new protocol as an alternative modality for severe pilon fractures.

• 대한간호학회지
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• 제42권2호
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• pp.258-268
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• 2012

Purpose: The purpose of this study was to identify the effects of the program to promote self management for patients with chronic hepatitis B. Methods: The research was a quasi-experimental design using a non-equivalent control group pre-post test. The participants were 61 patients, 29 in the experimental group and 32 in the control group. A pretest and 2 posttests were conducted to measure main variables. For the experimental group, the self-management program, consisting of counseling- centered activities in small groups, was given for 6 weeks. Data were analyzed using $X^2$, t-test, and repeated measures ANOVA with PASW statistics program. Results: There were statistically significant increases in knowledge, self-efficacy, active ways of coping, and self-management compliance but not in passive ways of coping in the experimental group compared to the control group over two different times. Conclusion: The results of this study indicate that the self-management program is effective in increasing knowledge, self-efficacy, active ways of coping, and self-management compliance among patients with chronic hepatitis B. Therefore, it can be usefully utilized in the field of nursing for patients with chronic disease as a nursing intervention for people with chronic hepatitis B.

• 로봇학회논문지
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• 제16권2호
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• pp.147-154
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• 2021

One of the most challenging issues when robots interact with the environment is to establish contact quickly and avoid high impact force at the same time. The proposed method implements the passive suspension system using the redundancy of the torque-controlled robot. Instead of utilizing the actual mechanical compliance, the distal joints near the end-effector are controlled to act as a virtual spring-damper system with low feedback gains. The proximal joints are precisely controlled to push the mid-link, which is defined as the boundary link between the proximal and distal joints, towards the environment with high feedback gains. Compared to the active compliance methods, the contact force measurements or estimates are not required for contact establishment and the control time delay problems do not occur correspondingly. The proposed method was applied to the landing foot control of the 12-DoF biped robot DYROS-RED in the simulations. In the results, the impact force during landing was significantly reduced at the same collision speed.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2009년 춘계학술발표대회 논문집
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• pp.129-133
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• 2009

country for green growth under minimizing boils to do change in climate under confronting boil the use of petrifaction resources energy and in change. Reduces the greenhouse gas and a environmental contamination, continuity for the growth which is possible demobilizes the greens and ecosystem, with alternative the roof which is an idle space from the construction water and the greens and uses creates in compliance with the effect which is various an energy economy and applies. Roof telerecording the synergy effect which follows with the effect which is various is not the energy saving which leads one effect which is simple in harmony and this lives together the environment which leads and possibility means that becomes the environmental element which hits.