• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.7
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• pp.1529-1533
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• 2005

In this paper designed available pre-amplifier to Intrabroadband power amplifier. Designed pre-amplifier used WJ company's AMI which frequency characteristic and noise characteristic are superior. Designed to have superior VSWR characteristic and frequency characteristic covering broadband of 100MHz ${\~}$ 3GHz using feedback. Designed ye-amp broadband special qualify such as EMC measurement equipment roll important position do to utilize to power amplifier of equipment that how consider.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.05
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• pp.95-100
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• 1997

In this paper, we propose a coding method to improve compression efficiency for MR image. This can be achieved by combining coding and segmentation scheme which removes noisy background region, which is meaningless for diagnosis, in MR image. The wavelet coder encodes only diagnostically significant foreground regions refering to segmentation map. Our proposed algorithm provides about 15% of bitrate reduction when compared with the same coder which is not combined with segmentation scheme. And the proposed scheme shows better reconstructed image Qualify than JPEG at the same compression ratio.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.51 no.8
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• pp.441-448
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• 2002

Harmonics studies have been an important aspect of power conversion system analysis and design in recent years. Harmonics using power conversion device, have a harmful effect on power qualify. Nonlinear load such as converter causes harmonic and effects self & other system. There are linear and nonlinear loads in the end-user application. For filter design to reduce harmonics, it is important to understand how loads interact with each other. In this paper, effects on the power conversion system at the low voltage local bus are discussed.

• Proceedings of the KIEE Conference
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• 2000.11d
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• pp.712-714
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• 2000

In the field of computer graphics, it approached the investigation of outstanding performance and high speed. Although most introduced Anti-Aliasing method were to meet these, it was not to improve speed. Because Anti-Aliasing method was focus on only qualify. Anti-Aliasing Effect is compensated from movement of object on the screen. Speed is important in the REAL-TIME application program like as 3D games. Cause Anti-Aliasing which needs great amount of time is not used in general. This Paper suggest the Efficient Anti-Aliasing method which apply Two-Point Anti-Aliasing Method that informs brightness data of the screen and use adjacent brightness data for real-time rendering.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.172-174
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• 2005

Recently, a concern of power qualify increases because of electronic device development and well-being generation. Power quality problems such as voltage sag, harmonics, flicker etc. have adverse effects on electric devices. Therefore, power quality problems have been monitored. This paper studies a detection of voltage sag that is more severer than the others. A voltage sag has been monitored using rms or wavelet method. This paper proposes an advance detection method using wavelet. An error Of Start Point differs error of ending point. We use this difference. So, we respectively revise detection error. Also, we revise multiplying average error rate.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.318-320
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• 2006

A control valve with deadband characteristics influences on the control dynamics. A control loop with deadband component shows cyclic control results and causes the wears of mechanical parts. A valve on the important process that require nonstop operation cannot be improved during operation. In case of control loops with deadband dynamics, the optimal control parameters based on the performance only are not sure of the good operation in point of protecting the control component. To improve the control performance and control oscillation, the control parameters should be changed to meet both control qualify and protection of control components.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.230-233
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• 2005

This paper proposes power qualify assessment using Markov Chain applied to Ergodic theorem. The Ergodic theorem introduces the state of aperiodic, recurrent, and non-null. The proposed method using Markov Chain presents very well generated harmonic characteristics according to the traction's operation of electric railway system. In case of infinite iteration, the characteristic of Markov Chain that converges on limiting probability Is able to expected harmonic currents posterior transient state. TDD(Total Demand Distortion) is also analyzed in expected current of each harmonic. The TDD for power quality assesment is calculated using Markov Chain theory in the Inceon international airport IAT power system.

• Annual Conference of KIPS
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• 2003.05b
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• pp.1289-1292
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• 2003

고속 대용량의 통합된 정보를 전송하기 위한 기간망(backbone network)과 가입자망(access network) 사이에는 병목 현상에 따른 congestion 문제가 불가피하다. 따라서 증가하는 가입자측의 대역폭 수요에 따라 가입자측까지 광케이블의 연결을 현실화할 수 있는 기술로서 PON(Pasive Optical Network)구조가 대두되고 있다. 본 연구는 네트워크 시뮬레이션인 OPNET을 사용하여 기존의 망과 가장 호환이 용이한 ethernet 기술을 이용한 PON 구조의 상향링크에서 ONU내에 traffic 타입에 따른 큐잉 알고리즘을 적용하여 QoS(Qualify of Service)를 보장하고자 한다.

• Journal of Korean Society of Rural Planning
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• v.7 no.1 s.13
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• pp.77-88
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• 2001

In order to evaluate the applicability of GWLF model which can efficiently estimate non-point and point source pollutant loadings in rural watershed including urban district, the model was applied to an experimental watershed. The model was calibrated using observed data such as daily runoffs, sediment yields, T-N, and T-P. Simulated daily runoffs and sediment yields by the model using calibrated parameters were in food agreement with the observed data. There were difference between the simulated and observed nutrient loading which was considered resonable. The simulated results by the model showed that T-N, T-P and sediment yields were dependent on the amount of stream runoff discharge and land use. GWLF model is believed to applicable to estimate amount of pollutant loading of non-point source pollution for the water qualify control of agricultural watersheds.

• Journal of radiological science and technology
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• v.21 no.2
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• pp.57-63
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• 1998

AEC was designed to assist in the production of radiographs of equal density and to aid in the production f consistently high quality radiographs. Many improvements have been made in the AEC and these have helped to increase it's acceptance. Newer system (Falling load) control kVp and mA as well as exposure time. Authors have had experiments about the characteristics of AEC by Zone System. Zone System is the method to detection of photographic image qualify by control the photo print from Fred Archer and Ansel Adams. With the Zone System theory the experiments of density control, characteristics of phantom thickness and reproducibility of occupation rate of contrast media could make quality control of X-ray photography effectively in falling load system.