• Proceedings of the Korea Contents Association Conference
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• 2003.05a
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• pp.454-460
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• 2003

while they cannot overcome the limitation that arises in the process of representing the 3D real world to the 2D plane. Also, there exists requirements on performance to support realtime navigation capability.In this paper, therefore, we propose a cell loading algorithm for navigating virtual space that can support realtime visualization according to the multimedia objects in variety and the change of the view point by user, and that can accommodate the capacity imposed in the process of navigation regardless of the number of objects.

• Journal of the Korean Applied Science and Technology
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• v.27 no.1
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• pp.87-92
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• 2010

Silicone surfactants are widely used in many industrial area because of its thermal stability and lower foaming property. But it has limitation to expand the application because of migration and bubble generation issues when it is mixed with organic surfactant. In this study, epoxy functionalized fluoro-silicone surfactant, perfluoro glycidoxypropyl polyether siloxane(PFGES), was synthesized using hydrosilylation reaction among perfluoro methyl hydrogen siloxane, allyl glycidyl ether, and allyl ployether in order to get lower surface tension, better thermal stability than conventional silicone surfactant, and reactivity with anhydride function.

• Proceedings of the Korea Multimedia Society Conference
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• 1998.04a
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• pp.366-370
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• 1998

One major limitation of the efficiency of parallel computer designs has been the prohibitively high cost of parallel communication between processors and memories. Linear order concentrators can be used to build theoretically optimal interconnection schemes. Current designs call for building superconcentrators from concentrators, then using these to recursively partition the connection streams O(log2N) times to achieve point-to-point routing. Since the superconcentrators each have O(N) hardware complexity but O(log2N) depth, the resulting networks are optimal in hardware, but they are of O(log2N) depth. This pepth is not better than the O(log2N) depth Bitonic sorting networks, which can be implemented on the O(N) shuffle-exchange network with message passing. This paper introduces a new method of constructing networks using linear order concentrators and expanders, which can be used to build interconnection networks with O(log2N) depth as well as O(Nlog2N) hardware cost. (All logarithms are in base 2 throughout paper)

• Journal of KIISE:Software and Applications
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• v.30 no.3_4
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• pp.285-292
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• 2003

Existing MPEG-4 players have limitation of screen blinks and drops of object rendering speed when user insert, delete, and replace objects on scenes. In this paper, an Object Priority Order Composition operated through the MPEG-4 player is proposed. This composition is the method for presentation user can insert, delete, and replace scene objects more efficiently. Therefore, this composition can show the MPEG-4 multimedia scenes without blinks and delays on MPR-4 player may seem random and natural.

• Journal of the Korea Computer Industry Society
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• v.5 no.1
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• pp.177-182
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• 2004

In sonar sensor design impedance matching design to each sensor affects the whole weighting circuit characteristic very much. But there are many examples that it is made by hands or very simple modeling designs. So these design works make trial and error because it is the limitation of flexible correspondence to the many sensors and follows many errors. This study explains organizations and skills in the sensor modeling package design program with real sonar sensor characteristic measure as the first step in impedance matching design.

• The Journal of Industrial Distribution & Business
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• v.3 no.1
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• pp.25-29
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• 2012

The purpose of this study is to examine the development of the pharmaceutical distribution industry. The pharmaceutical industry is are expected to suffer a heavy blow when the Free Trade Agreement (FTA) is introduced, despite its best efforts. Therefore, adequate solutions must be found. Section II introduces the Korean pharmaceutical distribution system and its current situation; Section III explores the distribution system's strengths and weaknesses. Section IV, identifies the problem and possible solutions for the Korean pharmaceutical distribution system; Section V summarizes and concludes this paper and acknowledges its limitations. Finally, this paper has a clear limitation. The lack of objective information and scientific analysis due to the data being based on interviews with company representatives is its most significant shortcoming. However, it offers implications for new directions for future research.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.7
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• pp.40-48
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• 2011

An attemperator is a part of the 4-stage superheater in the boiler system of the thermal power plant. The attemperator receives the over-heated steam and makes the steam with proper temperature by adjusting the control valve of the cold steam. In this paper, the attemperator is modeled considering physical point of view and the linearized model is derived for the control purpose. To overcome the integral windup phenomenon due to the opening limitation of the control valve, an anti-windup PI controller is proposed to the attemperator and compared with the PI controller operated in the thermal power plant in view of control performance.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.374-378
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• 2007

As people's living standard is being improved, human works are being replaced by robots. However, because roost robots are used in process industry, fixed on the ground, we need to develop human robots that have wide applications. Currently many researches are being conducted on human robots with the object of replacing human works, but because of lack of relevant hardware, such robots are being applied limitedly to very simple tasks. To overcome the limitation, the present study developed a kinematical mechanism and a controller. Based on human kinematics, the shoulders and the arms were composed of master arms with 3 degree of freedom, and we reproduced motions similar to human ones through the characteristics of joint variables and experiment on the trajectory of the end effector.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.5
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• pp.988-994
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• 2004

In this paper we analyze the effects of frequency offset, doppler spread, sampling and oscillator phase noise in mobile channels on orthogonal frequency division multiplexing(OFDM)system, Since this kind of distortions cause subcarrier interference which can be seen as additional noise, performance of OFDM system is degraded. We show the limitation of maximum carrier frequency offset and doppler frequency to maintain designated SNR, and analyze characteristics of the performance of OFDM systems considering the oscillator phase noise.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.5
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• pp.1020-1027
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• 2004

The existing 2D fashion Design System have a many limitation for application because diagraming piece database construct was weak as the function of design based on diagraming piece was low level. This paper design and construct the basic diagraming piece database to fashion design needed and through develop module of database search and modify, the system can easily manage the diagraming piece data and can create competitive and efficient design.