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Comparison of Grayscale Conversion Methods for Malaria Classification
JunYeon,Jong-Dae Kim,Chan-Young Park,Yu-Seop Kim,Hye-Jeong Song 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.1
Malariaparasitemia is used for measuring the degree of infection by detecting the plasmodium (commonly known as the malaria parasite) in the blood of an infected patient. The most commonly used method of malarial diagnosis is counting the number of malaria-infected red blood cells in a Giemsa-stained blood smear by using a microscope. This method requires expert knowledge and is prone to inter-investigator variability. Therefore, a number of studies have been conducted on automated classification techniques that can measure malarial infection rapidly and accurately. In order to detect malaria parasites by analyzing plasmodium-infected blood smear images, conversion processing is required to make the images insensitive to the luminance contrast of microscopy and staining intensity. This paper aims to identify a grayscale conversion method optimal for plasmodium-infected blood smear images by comparing the performances of various grayscale conversion methods. The grayscale conversion methods selected for the comparison are colorimetric conversion, luma coding, conversion using the green channel only, and principal component analysis (PCA)-based conversion. We used 20 malaria-infected red blood cells and 20 normal red blood cells to compare the performances of these methods by obtaining thearea under the receiver operating curve (AUC) as the minimum histogram intra-class variance value for each cell image. With the AUC value of 0.9225, the PCA-based grayscale conversion method outperformed all other methods.
Segmented analysis of a finite planar ridged tapered slot antenna array for wideband phased array
Kim, Junyeon,So, Joonho,Jang, Won,Cheon, Changyul Wiley Subscription Services, Inc., A Wiley Company 2008 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.50 No.5
<P>The segmented analysis method of a finite planar ridged tapered slot antenna (RTSA) array is presented to develop a wideband phased array with a triangular lattice. The RTSA array is segmented into two-parts with a feeder and the arrays of tapered slot antenna (TSA) and these scattering parameters are analyzed respectively. This proposed method gives the merit of a great reduction of computational cost. To verify the advantage of this method, we build the numerical model of only one feeder and dual polarized arrays of TSA with 10 × 12 elements. The measured results of the fabricated array meet the design goals of 3:1 bandwidth, scan volume of ±45°, active VSWR (AVSWR) below 3:1. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1140–1143, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23314</P>
Stability of Magnetic Domains With Notches in Permalloy Nanowires
Junyeon Kim,Myung-Hwa Jung,Sug-Bong Choe IEEE 2009 IEEE transactions on magnetics Vol.45 No.6
<P>Thermal stability of magnetic domains in ferromagnetic Permalloy nanowires is investigated by means of micromagnetic calculation with finite temperature. The magnetic domains, initially placed between two domain walls pinned at either artificial notches or edge roughness, are examined to be collapsed or not with thermal fluctuation. The stable domain size is revealed to be linearly dependent on the wire width, with different proportionality for different domain wall types-either transverse or vortex wall, irrespective to the wall alignment-either parallel or antiparallel to each other. The vortex walls provide regular stable domain size insensitive to the wire edge roughness, whereas the stability with the transverse walls is much influenced.</P>
Temperature Dependence of Domain-Wall Creep in Pt/CoFe/Pt Films
Junyeon Kim,Kab-Jin Kim,Sug-Bong Choe IEEE 2009 IEEE transactions on magnetics Vol.45 No.10
<P>The temperature dependence of the magnetic domain-wall creep behavior is examined in Pt/CoFe/Pt films with perpendicular anisotropy. The domain-wall creep behavior is monitored by a magneto-optical Kerr effect microscope equipped with a cryostat, which enables us to control the temperature from the ambient temperature down to 85 K. It is found that the domain-wall speed under a fixed magnetic field is decreased exponentially proportional to the inverse of the temperature, which can be explained as a typical behavior of the thermally activated process. By measuring the field-dependent domain-wall speed, we confirm that the domain-wall creep theory is valid with the value of the creep exponent 1/4, over the temperature range we examine.</P>
Simple Harmonic Oscillation of Ferromagnetic Vortex Core
Junyeon Kim,Sug-Bong Choe 한국자기학회 2007 Journal of Magnetics Vol.12 No.3
Here we report a theoretical description of ferromagnetic vortex dynamics. Based on Thiele’s formulation of the Landau-Lifshitz-Gilbert equation, the motion of the vortex core could be described by a function of the vortex core position. Under a parabolic potential generated in the circular magnetic patterns, the vortex core showed a circular rotation-namely the gyrotropic motion, which could be described by a 2-dimensional simple harmonic oscillator. The gyrotropic frequency and apparent damping constant were predicted and compared with the values obtained micromagnetic calculation.
클라이언트/서버 응용의 연산 부하 측정을 위한 시뮬레이터
이준연(JunYeon Lee),김대현(DaeHyun Kim),김영찬(YoungChan Kim) 한국정보과학회 1999 정보과학회 컴퓨팅의 실제 논문지 Vol.5 No.2
1990년대에 들어 컴퓨터 시스템의 급진적 발전으로 인한 소형 컴퓨터의 성능 향상과 가격 하락으로 보급량이 증가하고, LAN/WAN 및 인터넷등의 통신 기술 발달에 힘입어 여러 분야에서 많은 응용들이 클라이언트/서버 환경에서 개발되고 있다. 클라이언트/서버 환경을 도입하는 이유는 개방형 시스템으로의 표준화와 자원 공유, 확장성, 가용성, 응용의 생산성 등의 장점 때문이다. 클라이언트/서버 환경에서 운용되는 대부분의 프로그램은 다계층 구조에서 표현계층(사용자 인터페이스), 응용 로직, 그리고 데이타로 나뉘어질 수 있다. 클라이언트/서버 환경에서 최적의 성능을 얻기 위해서는 어느 자원을 어디로 분산하여야 하는가 하는 것이 문제가 된다. 만약 개발자가 코딩 단계에서 각 노드의 시스템의 부하 정보를 얻을 수 있다면, 클라이언트/서버 환경에서 부하가 적절히 분산된 최적의 프로그램을 쉽게 개발할 수 있다. 본 연구에서는 자바 소스 코드의 분석을 통하여 시스템 부하를 측정할 수 있는 시뮬레이터를 개발하였다. 시뮬레이터는 시스템 환경 변수와 자바 소스 코드를 받아들여 모의실험한 후, 응답시간을 라인 그래프 및 막대그래프의 형태로 표현한다. 마지막으로, 시뮬레이터의 정확성을 검증하기 위하여 임의의 프로그램을 선택하여 실제 실행 시간과 본 시뮬레이터에서 측정된 응답시간을 비교, 분석하였다. In 1990s, rapid advances in computer systems have made high performance computers with low price, and then resulted in the increase of these computers. And as a result of developing communication technology like a LAN/WAN and Internet, many programs have been developed on a client/server environment in various fields. The profits of client/server environment are a standardization of open-system, resource sharing, scalability, availability, productivity of application and so on. Most of programs operating on the client/server environment can be partitioned into presentation (user interface), application logic, and data in a multiple tier structure. To achieve the optimized performance in a client/server environment, issues such as which resources are distributed, and where to distribute should be discussed. If a developer is able to get the information of system load of each node at coding steps, he can easily develop an optimized program running on a client/server environment. In this paper, we present a simulator that can measure system load through analyzing Java source codes. The simulator obtains a system environment data and Java source codes from User, and then estimates the burden that was abstracted from Java source code, and represents a response time of program with a graph like a line, bar and pie graph. Finally, we analyze and compare above estimated data with real execution data to verify the correctness of the simulation result.