• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2725-2728
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• 2003

The manipulability of robot provides useful Information for the design and path planning of robots. This paper shows an influence of joint velocities to acceleration of robot end-effector using a dynamic manipulability polytope. The main idea of this paper is that the dynamic manipulability polytope of robot can be divided to three intermediate polytope, the torque-dependant polytope, velocity-dependent polytope, and gravity-dependant polytope. The velocity-dependant polytope is made from the limits of robot joint velocities while the torque-dependant polytope is made from the limits of the joint torques. Combining of these two intermediate polytopes and considering the gravity-dependant polytope, the overall dynamic manipulability polytope of robot is obtained. This investigation will be useful on the field of space robot and high-speed application.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2003.10a
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• pp.585-590
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• 2003

To overcome the drawbacks of conventional load control method and displacement control method, the so-called volume control method was developed by utilizing a pressure node added into a finite shell element. In this study, an improved volume control method which can analyze path-dependant behaviors of RC shell structures subjected to cyclic loading effectively is developed. RC shell structures are discretized with layered shell elements and in-plane two dimensional constitutive equations for concrete and reinforcements are implemented for each layer of the shell elements. Validity of the so-called path dependant volume control method is also verified by comparing analysis results with other data including experimental results.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.41-44
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• 2008

Fiber Reinforced Polymers (FRPs) have recently been highly used for repairing and strengthening civil structures due to their superior material properties. By using FRPs, external bond method is the most used method in the construction industry. Although many researches on reinforced concrete externally strengthened with FRPs have been conducted, time-dependant behaviors of the beams have not been investigated yet. This paper documents a series of beam experiments that were carried out to evaluate time-dependant behavior. Three RC beams were built and the parameters considered in this experiment were types of FRPs. Through these experiments, it was proved that the beam strengthened with CFRP was more effective than that with GFRP in terms of time-dependant behavior.

• Journal of Digital Convergence
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• v.13 no.9
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• pp.541-551
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• 2015

This research was a review and analysis of published articles and theses in Korea on Intervention Programs for patients with Diabetes Mellitus. A comprehensive search of databases was undertaken(Korean studies, Riss4u). using research terms such as"diabetes", "diabetes and education" "diabetes and exercise", "diabetes and intervention", "diabetes and education or exercise." 53 studies were analyzed focusing on type, application method, dependant variable and effect using descriptive statistics. 8 intervention type and 113 dependant variables were used. The most frequently used applied education and counseling and glycometabolism, self-care, self-efficacy the most frequently used dependant variable. The effects of dependant variables no effect or were different effects. Further reserarch in the digital convergence should requires the consideration of Structured content and exercise and the effect of the measurement variables, including the psychological variable effect.

• Childhood Kidney Diseases
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• v.13 no.2
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• pp.271-277
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• 2009

Kimura's disease is a chronic inflammatory disorder of unknown etiology. A 14 year old boy suffering from steroid dependant nephrotic syndrome, was presented with relapsing painless subcutaneous masses on the left buccal area. Blood analysis showed increased IgE and eosinophilia. During 4 years follow up, he was been treated by low dose steroid and short term cyclosporine. Consequently, frequent relapses of subcutaneous masses and nephrotic syndrome has been relieved. Cyclosporine treatment combined with steroid may be useful for preventing frequent relapse of Kimura's disease.

• Korean Journal of Adult Nursing
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• v.24 no.3
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• pp.253-265
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• 2012

Purpose: The focus of this research was a systematic review of published articles and theses for a degree in Korea and foreign countries on rehabilitation therapy for patients with total knee arthroplasty (TKA). Methods: The literature until December in 2011 were searched and the data basis included Medline, CINAHL, KERIS, National Library of Korea, and National Assembly Library web sites. Words for the search were TKA or TKA and rehabilitation. Studies included randomized controlled and non-equivalent control group pretest-posttest design. 31 studies were analyzed focusing on type, application method, dependant variable and effect using descriptive statistics. Results: Seventeen rehabilitation therapies and forty-nine dependant variables were used. The application methods of rehabilitation therapy were diverse. The most frequently used rehabilitation type was an exercise therapy and a pain/discomfort was the most frequently used dependant variable. The effects of rehabilitation therapy were inconsistent. Conclusion: The individualized rehabilitation therapy must be comprised of type, time, frequency, period and duration. Attention must be made as to the research design, especially the better measurement of the dependent variables. This review may serve as a base for future research.

• The Journal of Engineering Geology
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• v.4 no.1
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• pp.91-93
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• 1994

• ETRI Journal
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• v.35 no.1
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• pp.158-161
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• 2013

This letter proposes a low-power current-steering digital-to-analog converter (DAC). The proposed DAC reduces the clock power by cutting the clock signal to the current-source cells in which the data will not be changed. The 10-bit DAC is implemented using a $0.13-{\mu}m$ CMOS process with $V_{DD}$=1.2 V. Its area is $0.21\;mm^2$. It consumes 4.46 mW at a 1-MHz signal frequency and 200-MHz sampling rate. The clock power is reduced to 30.9% and 36.2% of a conventional DAC at 1.25-MHz and 10-MHz signal frequencies, respectively. The measured spurious free dynamic ranges are 72.8 dB and 56.1 dB at 1-MHz and 50-MHz signal frequencies, respectively.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2713-2716
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• 2003

This paper presents a dynamic manipulability analysis method of the limb moving in viscous fluid. The key idea of the presented method is that the boundary of joint velocity can be converted to the velocity-dependant dynamic manipulability polytope through the coriolis, centrifugal and drag terms in dynamic equation. The velocity-dependant dynamic manipulability polytope is added to the inertial and restoring force manipulability polytope to get overall manipulability polytope of the limb moving in the fluid Each of the torque and velocity bounds arc considered in the infinite norm sense in joint space, and the drag force of a limb moving in fluid viscous is modeled as a quadratic form An analysis example with proposed analysis scheme is presented to validate the method.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.53 no.9
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• pp.487-493
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• 2004

The electric power industry throughout the world is undergoing considerable changes from the vertically integrated utility structure to the deregulated market. However, the deregulated electricity market is operated with respect to theory of economical efficiency, and therefore, the system operator requires data with fast contingency ranking for security of the bulk power system. This paper compares the weather dependant probabilistic risk index(PRI) with the system performance index for power flow in the IEEE-RTS. The system performance index for power flow presents the power system stability. This paper presents fast calculation method for determining contingency ranking using the weather dependant probabilistic risk index(PRI). The probabilistic risk index can be classified into the case of normal and adverse weather. This paper proposes calculation method using the probabilistic risk index in determining contingency ranking required for security under the deregulated electricity market.