• The Journal of the Korea Contents Association
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• v.4 no.4
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• pp.179-187
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• 2004

In this paper, we have designed an LCD controller based on AMBA. Normally display systems using the LCD are adopted independent bus architecture for high speed data access. Proposed LCD controller complies with AMBA data format and has an image scaler that executes interpolation for full screen display. This image scaler employs FOI for horizontal scaling and H-Shape pseudomedian filter for vertical scaling. It has been designed with VHDL and verified on prototype board using Xilinx FPGA and LCD panel.

• 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 radiological science and technology
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• v.24 no.1
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• pp.17-22
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• 2001

Medical X-ray examination are increased double for the last $6{\sim}8$ years. Therefore a patient exposure dose should be decrease half every 7 years. We made an experiment on copper filter thickness to decrease a patient exposure dose up to half and compared to the Image quality by MTF. The results as follow 1. A thin region like extremities needs a thicker Cu filter as compared a thick region. 2. 1/2 reduction filter must be thicker when kVp Increase. 3. Exposure factor should be increas when using 1/2 reduction filter ; extremity is 4.0 times, chest 2.9 times, skull 1.62 times, and abdomen 1.58 times 4. The MTF of using 1/2 reduction filter is lower than without filter. But no difference of visual image. 5. 1/2 reduction filter compared with double speed screen showed almost same image quality.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.850-853
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• 2005

This paper presents issues of display hardware architecture, relating to memory, display driver IC architecture, and chip-to-chip interface. To achieve a low power and low cost mobile phone, not only the display architecture must be carefully selected, but also the driver-ICs optimized to accommodate the different modes of operation found in typical handheld devices. The technique of forming a photo sensor in each pixel using TFT and display module architecture are developed to add multi functions in display such as fingerprint recognition, image scanning, and integrated touch screen. Detailed architectures of IC partitioning, high-speed serial interface, D/A converter, and multi functions such as fingerprint recognition and image scanning using photo sensors are important to a power optimized system.

• Proceedings of the KIEE Conference
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• 2003.07e
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• pp.117-119
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• 2003

Recently, Radio Frequency Identification (RFID) cards have been charming increasing attention. In addition, the RFID card ensures high durability and ease of maintenance because it has no built-in contact. And the benefits of RFID cards over contact cards are primarily due to the increased transaction speed and convenience brought to the cardholder. In this paper, we have developed a RFID card reader for the multi-purpose applications. The vicinity card reader with large-screen to display user ID and card number for a kinds of applications such as entrance and attendance management system is suitable for the use with EM card and TEMIC card, featuring easy to mount and reliable quality. The read range of the proposed RFID card reader is 70cm. This paper also addresses current RFID technology in terms of systems and provides a look forward its future applications in the aviation environment using RFID smart card.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.28-32
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• 1997

This study aims at developing the high speed/intelligent machining system suing the plug/play method of an open architecture controller. The plug/play technology by the Application Specific Function (ASF), can readily implement the open architecture controller into various machining system or other automatic equipments. For the open architecture controller, this study developed the open HMI, screen editor, ASF, visual builder, and controller OS technology as software components. On the other hand, we developed the I/O module and main board as control hardware system. This study, as an example, presents integration of individual component technologies for the plug/play type open architecture CNC system.

• Journal of radiological science and technology
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• v.5 no.1
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• pp.45-47
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• 1982

Authors carried out the research on the actual condition of intensifying screens in a certain hospital and obtained the results as follows: 1. High speed intensifying screens were 63.9% and medium typed screen had 36.1%. 2. Half the number of using screens(51.5%) were not clear in a period of used time. 3. 47.4% of same typed screens showed a remarkable difference(two times) in sensitivity.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.1085-1087
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• 2002

To have cost down and get improved image quality and performance of plasma display panel, several factors have been developed including development of low price material and improvement in production for PDP front plate. In this work, viscosity and surface characteristics of transparent dielectric were investigated to find the optimum and low price materials fabrication condition of transparent dielectric paste. It was found that uniformity and transmissivity of green and fired dielectrics had some relationship with the kinds and content of binder, and solvent as well.

• Proceedings of the Acoustical Society of Korea Conference
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• 1994.06a
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• pp.710-715
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• 1994

The program name TOLAPS is an acronym for Take-Off LAnding Profile Simulation. Some of the interesting features of this program is the ability to detect flight performance effects of airport altitude, ambient temperature, air pressure and wind. TOLAPS can also handle effects of TOW and LW. The program user can also calculate profiles by user difined flaps and thrust settings deviating from recommended standard settings for each aircraft. Wind effects on straight out flying as well as turns can also be demonstrated. Output form TOLAPS are either screen graphics of profiles (altitude, speed or thrust versus flight distance) or flight track. Profiles can also be made in a tabular form, ready for use in most airport noise calculation programs. In this way, TOLAPS is a valuable tool to evaluate effects of noise abatement procedures.

• Journal of Korean Society for Atmospheric Environment
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• v.9 no.2
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• pp.168-173
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• 1993

Air quality impacts of point and area sources were analyzed by using ISCST2 with wind speed and stability class combinations of SCREEN. Stack height was important in determining the impact of point sources. With the stack height reduced to 21m from 75m, the concentration in the vicinity increased several times in spite of decreasing the emission rate by half. When the emission rates were same, concentrations from an area source of 10m release height were slightly lower than those from a point source of 21m stack height at the plume centerline. Bur the area source resulted in larger area of high concentration. Concentration from the point source was high in neutral to slightly unstable conditions with strong winds in a short distance, and in stable conditions with weak winds in a long distance. Concentration from the area source decreased with distance from the source, and was high in stable conditions with weak winds.