Sangwook Park

A color interpolation algorithm is necessary to acquire color images of good quality with a digital still camera in which a single CCD image sensor is equiped. Since a color filter array is adopted, we must interpolate missing color values in the red, green, and blue channels at each pixel location. Inappropriate color interpolation causes color arti- facts, resulting in degraded color resolution. A color interpolation algo- rithm with a variable color ratio is proposed by incorporating cross- c

Recently, color filter array patterns based on optimal design by reducing interchannel aliasing have been developed. Although these optimally subsampled patterns produce less degradation of resolution for the images in daylight about 6500 K, aliasing and grid effect become more prominent under the different lighting conditions. Moreover, the color interpolation (CI) for Bayer pattern cannot be utilized for these patterns. Since it is impossible to change coated patterns according to various cond

A 42-years-old woman had undergone operation for cholecochal cyst with gallbladder cancer 9 years ago. Pathology revealed a polypoid mass in the gallbladder with liver infiltration as poorly differentiated adenocarcinoma. Computed tomography, magnetic resonance cholangiopancreatography, and endoscopic ultrasound showed a newly developed suspected solid nodule in the peripheral portion of cystic lesion in the pancreas head. She underwent a pylorus preserving pancreaticoduodenectomy for the suspec

비지역적 평균 기반 영상 잡음 제거 알고리즘은 이론적 배경이 간단한데 반해 영상 잡음 제거 성능은 우수하여 최근 가장널리 사용되는 잡음 제거 알고리즘 중에 하나이다. 그러나 기존의 비지역적 평균 기반 알고리즘도 여전히 평탄 영역에서의 잡음 제거 효과가 미흡하며 잡음 제거 과정에서 경계 및 패턴 영역의 흐려짐과 같은 문제점이 있어 다양한 방식으로 개선된 알고리즘이 개발되고 있다. 본 논문에서는 비지역적 평균값을 구할 때 사용되는 가중치를 가중치 정렬을 통해 재 정의된 임계치로서 갱신하고 그로부터 잡음 제거 효과를 향상시키는 개선된 비지역적 평균 알고리즘을 제안한다. 가중치 정렬을 통해 갱신된 가중치들을 통해 경계 및 패턴 영역에서 보다 고르고 선명하게 가중치를 구할 수 있어 결과적으로 잡음 제거로 인한 흐려짐 없이 잡음 제거가 가능하다. 다양한 잡음 정도를 갖는 실험 영상에 제안된 방법을 테스트하여 기존에 제안된 비지역적 평균 기반 알고리즘들에 비해 시각적, 수치적 성능에서 우수한 결

In this paper, we suggest a method for discretized frequency modulations of ultrasonic signals. A continuous sweep of frequency modulation signals can be modelled with fine levels of discretization. If the ultrasound signals are modulated with monotonically decreasing frequencies, then the cross-correlation between an emitted signal and received signal can be used to identify the distance of multiple target objects. For the discretized frequency synthesis, CF ultrasounds with different frequenci

Transferrin binding protein (TfBP) is a cytoplasmic glycoprotein that was originally isolated from the chick oviduct. As we previously demonstrated the constitutive expression of TfBP in the avian nervous system, in this study we examined whether TfBP is expressed in the reptilian nervous system. In accordance with previous findings in the chicken, oligodendrocytes were most prominently labeled by antiserum to TfBP. Great variability was observed between different regions of the central nervous

동영상 잡음 제거에 있어서 비지역적 평균 기반 시공간 잡음 제거 알고리즘을 제안한다. 기존에 제시된 비지역적 평균 기반 알고리즘은 잡음 제거에 우수한 성능을 보이지만 연산량이 많고 여러 장의 장면 기억장치가 필요하기 때문에 하드웨어 시스템 구현에많은 어려움이 있다. 그러므로 제안된 알고리즘에서는 무한 충격 응답 기반 시간 영역 잡음 제거 알고리즘을 도입하여 움직임이적은 영역에서는 자연스러운 잡음 제거가 가능하며 움직임이 많은 영역에서는 연산량 측면에서 효율성을 고려하여 개선된 비지역적 평균 기반 잡음 제거 알고리즘을 적용하여 움직임에 의한 흐려짐을 최소화 하면서 잡음 제거를 수행하였다. 다양한 잡음 정도를갖는 시험 영상에 대한 실험을 통해 수치적, 시각적 측면에서 각각 비교하여 제안된 알고리즘의 성능이 기존의 알고리즘과 대등하거나 촬영 영상에 따라서는 우수한 성능을 보임을 확인할 수 있었다.

It is known that big brown bats can distinguish echo of a prey at various angles. In this paper, we suggest a new object localization strategy using ultrasonic echolocation. We calculate the relative energy ratio between a high frequency component of ultrasound signal and a low frequency component of ultrasound signal for a target object. We found the measure depends on bearing angle of the object in space. We also tested energy ratio of echoed FM ultrasound signals depending on frequency, based

This study aims to provide suggestions for multicultural education as human resource development education after examining problems of multicultural education by interviewing NGO, schools, public organizations, and children from multicultural families, analyzing the necessity of human resource development education. The result of the interviews and analysis is summarized based on the principles of a qualitative research method. The results of this study are as follows. First, current multicultur

We investigated pyrolysis characteristics of the RDF in pyrolysis chamber of a pyrolysis melting incinerator with disposal rate of 30 kg/hr. As operating parameters, inner wall temperature of the chamber and feeding rates were selected. The weight of pyrolyzed RDF discharged from the exit of pyrolysis chamber was measured. The components of pyrolyzed RDF were analyzed by proximate analysis and ultimate analysis. Heating value was calculated from the Dulong’s equation. The surface of char located

Analysis of the curriculum in North Korea should be a top priority in establishing strategies for unification of Korea in the field of education. The purpose of this study is to provide fundamental data about education in North Korea to researchers and a motive for decision-making to lead investment to research on North Korea. In order to achieve this purpose, the research trend on the curriculum in North Korea has been looked through from previous research. The curriculum in South and North Kor