• Journal of Korean Society of Water and Wastewater
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• v.26 no.2
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• pp.257-264
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• 2012

The concept of a non-contact type of UV disinfection system was introduced in this study. UV lamps and their quartz sleeves hang over the water surface and there is no interface between the sleeve and water. Obviously, there is no fouling. Based on optical laws and other UV distribution models, a detail mathematical model for a non-contact type UV disinfection system was developed in this study. Pathway length of UV light in a non-contact type photoreactor is longer than that in a submerged type photoreactor because the light is more refractive while passing through 3 interfaces of medium. But the pathway length passing through the water media is not significantly longer than that in a submerged type photoreactor so, the absorption of UV light by water is not significantly different from the other system. Due to the reflection effect, UV intensity is rapidly decreased as the horizontal distance from the light source is increased. The reflective attenuation in a non-contact type photoreactor is higher than that in a submerged type photoreactor. These mean that the short photoreactor is advantageous than the narrow-long photoreactor for the non-contact type photoreactor in an optical point of view.

• Journal of the Korea Safety Management & Science
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• v.15 no.4
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• pp.17-24
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• 2013

On this study, we extracted pending problem and controversial point from management of disaster such as terror for domestic massive performance and then, investigated countermeasure plan against disaster for massive performance through comparison and analysis between anti-disaster strategy of Korea and U.S. U.S are conducting security system actively for passenger of major facilities such as public institution. Nonetheless, In U.S that has the world's best security system, serious affair such as 911 terror and Boston marathon terror are continued to happen. When considering domestic situation that North Korea and South Korea are antagonistic to each other, it is judged when it is high time to prepare for threat of terrorism. Accordingly, On this study, through analyzing of latest terror attacks in U.S and disaster risk in the nation, we analyzed in detail countermeasure plan classified as legislation, operation of security system, instilling a sense. As the result of this analyzing, using by flow-chart, we suggested domestic optimized disaster management system for massive performance. Consequently, we propose to establish systematized disaster management system such as preliminary survey of disaster influence for massive performance.

• The Korean Journal of Health Service Management
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• v.6 no.3
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• pp.171-182
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• 2012

We tried to look for parenting stress and social support of parents who look after children with mental retardation, intellectual disability, physical disability, and deafness. We also tried to know type and severity of parenting stress and inform a necessity of a resource and social support through the study. We subjected parents who have children with disability and visit 7 medical centers to treat in the 4 cities. The parents filled out the questionnaire. We analysed the scale of parenting stress and social support using Likert 5 point scale. As a result of parenting stress and social support according to general characteristics by type of disability, parenting stress was very high regardless of type of disability. However, the parents who have children with disability had lower social support. In detail, the parents who have children with mental retardation had the highest parenting stress, and the parents who have children with deafness had the lowest parenting stress. In the social support, the parents who have children with mental retardation received high social support, and the parents who have children with intellectual disability received low social support.

• Bulletin of the Korean Chemical Society
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• v.35 no.9
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• pp.2655-2659
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• 2014

Dual specificity protein phosphatase 4 (DUSP4) has been considered a promising target for the development of therapeutics for various human cancers. Here, we report the first example for a successful application of the structure-based virtual screening to identify the novel small-molecule DUSP4 inhibitors. As a consequence of the virtual screening with the modified scoring function to include an effective molecular solvation free energy term, five micromolar DUSP4 inhibitors are found with the associated $IC_{50}$ values ranging from 3.5 to $10.8{\mu}M$. Because these newly identified inhibitors were also screened for having desirable physicochemical properties as a drug candidate, they may serve as a starting point of the structure-activity relationship study to optimize the medical efficacy. Structural features relevant to the stabilization of the new inhibitors in the active site of DUSP4 are discussed in detail.

• Korean Journal of Adult Nursing
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• v.19 no.3
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• pp.401-412
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• 2007

Purpose: The purpose of this study was to determine the relationship between assessed pain, functional status, and emotional status in elderly women with dementia. Methods: The method was a descriptive correlational design. Subjects were sampled from 75 elderly women with dementia who were resident in nursing home. and their pain, functional status(physical function, cognitive function), emotional status(depression, agitation) were measured. The collected data were analyzed for correlations between pain and functional status and for emotional status using the SPSS 11.0 statistical program. Results: The pain degree of the aged women in dementia were as follows; between 0 and 27 points, average 4.04 points, which was a possible point extent. Looking at the grades in detail items, the wry face expression was shown highest, an average of 0.84 points. The relation with cognitive function was(r=-.259, p<.025) a minus relation. And the relation with physical function was (r=.406, p<.001) a plus one. The relation with depression was (r=.462, p<.001), plus one. And (r=.592, p<.001) a plus relation was found with agitation. Conclusion: Pain is associated with impaired functional and emotional status. Major efforts are needed to improve nursing assessment and management of pain in this cognitive impaired population.

• International Journal of Fuzzy Logic and Intelligent Systems
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• v.15 no.4
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• pp.232-239
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• 2015

Studies on the control of the inverted pendulum type system have been widely reported. This is because it is a typical complex nonlinear system and may be a good model for verifying the performance of a proposed control system. In this paper, we propose the design of some fuzzy logic control (FLC) systems for controlling a Segway-type mobile robot, which is an inverted pendulum type system. We first derive a dynamic model of the Segway-type mobile robot and then analyze it in detail. Next, we propose the design of some FLC systems that have good performance for the control of any nonlinear system. Then, we design two conventional FLC systems for the position and balance control of the Segway-type mobile robot, and we demonstrate their usefulness through simulations. Next, we point out the possibility of simplifying the design process and reducing the computational complexity,, which results from the skew symmetric property of the fuzzy control rule tables. Finally, we design two other FLC systems for position and balance control of the Segway-type mobile robot. These systems have only one input variable in the FLC systems. Furthermore, we observe that they offer similar control performance to that of the conventional two-input FLC systems.

• Journal of Power Electronics
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• v.17 no.2
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• pp.522-532
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• 2017

This paper presents a novel integrated structure for a cascaded distribution static compensator (D-STATCOM) and distribution transformer for medium-voltage reactive power compensation. The cascaded multilevel converter is connected to a system via a group of special designed taps on the primary windings of the Dyn11 connection distribution transformer. The three-phase winding taps are symmetrically arranged and the connection point voltage can be decreased to half of the line-to-line voltage at most. Thus, the voltage stress for the D-STATCOM is reduced and a compromise between the voltage rating and the current rating can be achieved. The spare capacity of the distribution transformer can also be fully used. The working mechanism is explained in detail and a modified control strategy is proposed for reactive power compensation. Finally, both simulation and scaled-down prototype experimental results are provided to verify the feasibility and effectiveness of the proposed connection structure and control strategy.

• Journal of Ubiquitous Convergence Technology
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• v.2 no.2
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• pp.88-96
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• 2008

IPTV Content delivery systems over wired networks confront scalability problems due to their high network bandwidth requirement for real-time services. Especially, VoD service provides Trick Mode features such as pause, fast forward and similar operations. However, Trick Mode services are delivered by the method of unicast only for controlling of the stream. With a point of views, this paper propose a new real-time multimedia streaming architecture over IP Networks, which tries to achieve bandwidth efficiency and supporting for mass clients better than traditional unicast services. The proposed methods divide the Transport Stream into a series of segments. After that, this divided partial Transport Stream makes multicast streaming periodically. Meanwhile Set-top Box of a client makes a rearrangement orderly by using Presentation Time Stamp field from the served Transport Stream packets. While the current Transport Stream segment is playing, it should be guaranteed that the next segment is downloaded on time. Consequently, the original video content can be played out continuously. The detail introduction of a new real-time multimedia streaming system with analysis and simulation follows as below.

• The KSFM Journal of Fluid Machinery
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• v.5 no.3 s.16
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• pp.15-24
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• 2002

This paper presents an experimental study on the unsteady flow phenomena such as leakage flow and rotating stall which have influences on the performance and stability of an axial flow fan. For this study, unsteady pressure were measured using high frequency pressure transducers mounted on the easing wall of rotor passage and analyzed by Double Phase-Locked Averaging Technique. As the flow rate was reduced to near stall point, the pressure difference between the pressure and the suction side of the blade was increased especially new the leading edge and the lowest pressure zone of suction side was gradually developed. From the result of unsteady pressure field on the casing wall, one period of rotating stall was divided into three zones and the flow characteristics on each zone were described in detail.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.7 no.5
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• pp.376-383
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• 1996

In general, the electromagnetic field analysis of a vertical dipole mainly deals with the space. wave. But when only the space wave is considered, as a receiving point is close to the surface of medium, the receiving electric field strength is rapidly decreased. In this paper, to solve this problem, we considered both the surface wave and the space wave contribution. When the vector potential is used with the angular spectrum transformation method, the space wave and the surface wave are included in the final electric field expression. By using this final electric field expression, the effect of the surface wave is analyzed through simulations and the factors having effect on a propagation phenomenon of sea surface are studied in detail. Also, the justification of the theoretical formula was proved by comparing theoretical values with measuring ones at 880. 2MHz which is the frequency of mobile communication.