• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.10
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• pp.2380-2386
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• 2013

A PLL with an unipolar charge pump and a loop filter consisting of sample-hold capacitor and 2nd-order RC filter has been proposed. The goal of the proposed PLL is the suppression of reference spur which is caused by charge pump mismatch. It also improves phase noise characteristic. It has been designed with a 1.8V $0.18{\mu}m$ CMOS process and proved by HSPICE simulation.

• Korean Chemical Engineering Research
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• v.56 no.1
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• pp.56-60
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• 2018

There have been a lot of study to improve the performance of membrane filters as the removal of particulate matter has been of great interest due to the negative effects. Among the membrane fabrication techniques, the electrospinning technique is the most promising because it can produce uniform fibers ranging from nano to micrometer size. The electrospun membranes will greatly improve the filtration performance due to the high ratio of surface area to volume and the high porosity. In the present study, polystyrene (PS) and cellulose acetate (CA) polymers were used to produce the membranes with carbon nanotube (CNT), showing the filtration performances were improved with the optimal amounts of CNT.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.12
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• pp.2511-2520
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• 2011

This paper describes the parameter adjustment method of fuzzy membership function to improve the performance of multi-sensor fusion system using adaptive fuzzy-Kalman filter and cross-validation. The adaptive fuzzy-Kanlman filter has two input parameters, variation of accelerometer measurements and residual error of Kalman filter. The filter estimates system noise R and measurement noise Q, then changes the Kalman gain. To evaluate proposed adaptive fuzzy-Kalman filter, we make the two-axis AHRS(Attitude Heading Reference System) using fusion of an accelerometer and a gyro sensor. Then we verified its performance by comparing to NAV420CA-100 to be used in various fields of airborne, marine and land applications.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.37 no.3
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• pp.45-55
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• 2000

In this paper, we proposed the hardware architecture of wavelet transform digital filter for an image processing. Filter bank pyramid algorithm is used for wavelet transform and each fillet is implemented by the FIR filter. For DWT computation, because the memory controller is implemented by hardware, we can efficiently process the multisolution decomposition of the image data only input the parameter. As a result of the image Processing in this paper, 33㏈ PSNR has been obtained on 512$\times$512 B/W image due to 11-bit mantissa processing in FPGA Implementation. And because of using QMF( Quadrature Mirror Filter) properties, it reduces half number of the multiplier needed DWT(Discrete Wavelet Transform) computation so the hardware size is reduced largely. The proposed scheme can increase the efficiency of an image Processing as well as hardware size reduced. The hardware design proposed of DWT fillet bank is synthesized by VHDL coding and then the test board is manufactured, the operating Program and the application Program are implemented using MFC++ and C++ language each other.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.153-154
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• 2012

여러 개의 셀을 직렬 연결하여 사용하는 대용량 리튬-이온 배터리 사용이 많아지면서 각 셀 간의 전압 평형문제가 중요해지고 있다. 직렬 연결된 각 셀들의 전압이 평형을 이루지 않게되면 그 배터리의 용량을 충분히 활용하지 못하게 되고 배터리 수명 또한 줄게 된다. 셀들 간의 전압 불균형을 바로 잡기 위해선 별도의 셀 전압 균등화 회로가 필요 하다. 본 논문에서는 플라이백 다권선 변압기를 이용한 셀 균등화 회로에서 2차측의 누설 인덕턴스에 의해 생길 수 있는 출력 전압의 차이를 LC필터를 통해 보상하여 셀을 일정한 전압으로 평형을 이룰 수 있도록 하는 회로를 제안하고 시뮬레이션을 통하여 그 타당성을 검증 한다.

• Clean Technology
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• v.6 no.2
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• pp.121-127
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• 2000

There are several kinds of hazardous materials in incinerator flue gas, such as particulate matter, acid gas, heavy metal, dioxin, etc. The activated carbon adsorption is considered as one of the methods removing dioxin from flue gas. Without any additional equipment and facilities, the activated carbon was mixed with lime and sprayed in the semi-drying reactor of an incinerator and filtered in the bag filter, and its efficiency of removing hazardous organic material was investigated. 1,2-dichlorobenzene (o-DCB) was used as a precursor material of dioxin and the effects of the activated carbon amount, the operating temperature of the reactor, and the atomizer r.p.m were measured and analyzed. Experimental results showed that the optimum outlet temperature of the reactor was $145^{\circ}C$ considering the performance of the bag filter, and the adsorption performance improved with the increase of the atomizer r.p.m. Also the performance of removing o-DCB in the bag filter is higher than of the semi-drying reactor.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.44 no.6
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• pp.36-42
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• 2007

According to the increased demand of high quality multimedia content, it needs to recover an old movies. But the film of old movie is damaged with line scratches and dust. In this paper, the detection and restoration algorithm of B/W line scratch is proposed. Our scheme estimates and interpolates the damaged partial information of line scratch using the linear recursive curve trace which consider the intensity values of left and right region of line scratch and then median filtering processed. As a result, the film image PSNR 44.68 with B/W line scratch is increased up to 48.60 and the intensity of the interpolate pixel is approached about 14 against the pixel of original image.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.2
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• pp.141-148
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• 2001

There are several ways for reducing EMI(Electromagnetic Interference) in the switching power supply, which can be largely divided into suppression methods in the noise source, noise path solution, and attenuation techniques using the filter. In this paper, the method will be discussed to simplify the design process of the filter along with the noise path solution. In particular, some practical EMI suppression methods are suggested for SMPS, which is widely used recently, with or without a chassis, respectively and also verified through the experimental results of a 10W flyback converter.

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.6
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• pp.76-82
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• 1985

The convergence properties of Burg algorithm, which is commonly used to calculate the reflection coefficients in the adaptive lattice filters, are studied in this paper. Applying the $\mu$ algorithm to Burg algorithm, a new adaptive lattice $\mu$ algorithm is derived and it shows that the convergence speed of this algorithm is higher than that of Burg algorithm. As a result of theoretical analysis and computer simulation, it is proved that the con-vergence speed of the proposed algorithm is remarkably higher than that of Burg algorithm when the convergence speed of Burg alsorithm is low.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.5 no.3
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• pp.257-265
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• 2007

Spent filter wastes of about 1,000 units (200 L) have been stored in the waste storage facility of the Korea Atomic Energy Research Institute since its operation. At the moment, to secure space in a waste storage facility as well as to efficiently manage spent filter wastes, it is necessary to conduct a compaction treatment of these spent filters, and finally, to repack the compacted spent filters into a 200 liter drum. To do that, the spent filter wastes were first classified according to their generation facilities, their generation date and their surface dose rate by investigating the inventory of the spent filters. In order to repack a compacted spent filter in a 200 liter drum, it is first necessary to conduct a radionuclide assessment of a spent filter before compacting it. Therefore, after taking a representative sample from a spent filter without a dismantlement, the nuclide analysis for it will be conducted. And then, after putting a spent filter into a regular drum by conducting the columnar shaping of the hexahedral form of a spent filter, the compaction treatment of the shaped spent filter will be conducted by vertically compacting it.