ECG 특징추출 기반 개인 바이오 인식

윤석주,김광준,Yoon, Seok-Joo,Kim, Gwang-Jun 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.4

개인의 신원을 확인하기 위해 인간의 생물학적 특성을 사용하는 방법에 대한 연구가 활발히 진행되고 있다. 심전도를 이용한 생체 인식 기술은 피험자에 피부자극을 일으키지 않고 위조가 어렵다. 기존의 생체 인식 시스템인 지문, 얼굴 등의 인식시스템과 쉽게 접목이 가능하여 다중 생체 인식 시스템으로 응용할 수 있다. 본 논문에서는 이산 웨이블릿 변환 계수를 사용한 심전도의 파형 특성분석법으로 개인을 식별하는 방법을 제안하였다. 심전도 신호의 특징추출은 총 9개의 이산 웨이블릿 변환 계수를 대상으로 상관 계수 분석으로 수행하였다. 식별은 각 클래스의 특징벡터를 입력으로 오류 역전파 신경망을 적용하여 수행하였다. MIT-BIH QT 데이터베이스내 24명의 심전도에 대해 98.88%의 식별율을 나타냈다. Research on how to use the biological characteristics of human to confirm the identity of the individual is being actively conducted. Electrocardiogram(: ECG) based biometric system is difficult to counterfeit and does not cause skin irritation on the subject. It can be easily combined with conventional biometrics such as fingerprint and face recognition to give multimodal biometric systems. In this thesis, biometric identification method analysing ECG waveform characteristics from Discrete Wavelet Transform(DWT) coefficients is suggested. Feature selection is performed on the 9 coefficients of DWT using the correlation analysis. The verification is achieved by using the error back propagation neural networks. Using the proposed approach on 24 subjects of MIT-BIH QT Database, 98.88% verification rate has been obtained.

가솔린 자동차의 희박연소시스템 적용을 위한 연료공급 최적화에 관한 연구 (I) - 가솔린 인젝터의 연료분열특성에 관한 연구 -

윤석주,조대진,방두열,Yoon, S.J.,Cho, D.J.,Pang, D.Y. 한국액체미립화학회 1998 한국액체미립화학회지 Vol.3 No.3

In recently, a study on the lean combustion is investigated intensively, because it is expected that this method may decrease the harmful exhaust gas and improve fuel economy in gasoline engine. The problems of lean combustion system in gasoline engine are ignition difficulty, misfire and instability of combustion. The investigation on the optimization of fuel metering and the control of mixing gas flow may be critical to improve the performance of lean combustion. In the fuel injection gasoline engine, the formation of mixture influences strongly on the engine performance such that the importance of fuel metering system becomes apparent. First of all, a study on the fuel breakup characteristics of gasoline fuel injector was carried out in this paper. Fuel injectors are pintle and 4hole-2spray type. The purpose of this study is to clarify the atomization mechanism of spray injected into atomosphere field through electronic controlled-fuel injectors, and to analyze spray characteristics such as drop size distribution and mean drop diameter produced at fuel injector. In this paper, the spray development is observed by taking photograps using 80mm still-camera system, and drop sizes are measured by PMAS. From these experiment, spray pattern injected from gasoline fuel injectors was investigated clearly. Also, it was found that SMD and drop size distribution of injected fuel spray from gasoline fuel injectors.

DCT, DWT와 신경망을 이용한 심전도 부정맥 분류

윤석주,김광준,장창수,Yoon, Seok-Joo,Kim, Gwang-Jun,Jang, Chang-Soo 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.4

본 논문은 DCT, DWT와 역전파 신경망을 이용하여 MIT-BIH 부정맥 데이터베이스의 심전도 신호로부터 정상파와 부정맥 분류를 제안하였다. 역전파 신경망에 사용할 특징입력을 추출하기 위해 첫 번째 단계에서는 DCT 변환을 이용하여 15개의 계수를 선택하였다. 두 번째 단계에서는 DWT 변환 후 각 detail 계수들의 최대값, 최소값, 평균, 분산, 표준편차를 추출하였다. 역전파 신경망은 55개의 특징입력을 이용하여 정상파와 부정맥 파형을 분류하였고, 98.8%의 분류 성능을 나타냈다. This paper presents an approach to classify normal and arrhythmia from the MIT-BIH Arrhythmia Database using Discrete Cosine Transform(DCT), Discrete Wavelet Transform(DWT) and neural network. In the first step, Discrete Cosine Transform is used to obtain the representative 15 coefficients for input features of neural network. In the second step, Discrete Wavelet Transform are used to extract maximum value, minimum value, mean value, variance, and standard deviation of detail coefficients. Neural network classifies normal and arrhythmia beats using 55 numbers of input features, and then the accuracy rate is 98.8%.

한우의 주요 조직 적합성 항원 규명

윤석주,권명상,Yoon, Seok-joo,Kwon, Myung-sang 대한수의학회 1995 大韓獸醫學會誌 Vol.35 No.2

The characterization of the MHC of domestic animals may constitute a first step towards increasing the efficiency of food production through improved disease resistance. In order to study the role of the MHC in regulating immune response it is first necessary to identify the different MHC alleles. In this research we try to investigate the possible associations between BoLA of Korean native cattles and infectious cattle disease. For this purpose we used one approach, serology. The results were summarized as follows : 1. Korean native cattle's lymphocyte reacted with alloantisera which recognized seven official BoLA allele. Korean native cattle's lymphocytes were reacted same as European breeds(especially with 673/3(W20)). 2. Korean native cattle's lymphocytes reacted with alloantisera 773/2, 673/3, 638/3, 773/3, 602/2, 639/2 and 639/3 at high reaction frequency. But alloantisera 642/1 was not expressed on Korean native cattle. If this allele, recognized by alloantisera(642/1), officially certificate In BoLA workshop it will be characterization factor of Korean native cattle. 3. According to cellular similarity index, we can presume on genetic relativity which has no family relationship.

송풍형 로터리 버너의 특성

윤석주(S. J. Yoon),최영하(Y. H. Choi),김경훈(K. H. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5

Liquid atomization by means of a spinning cup is widely used as a device for combustion, in cooling and spray drying. In this study, the blowing type rotary atomizer was experimental carried out the investigations on the characteristics of the blowing type rotary atomizer which ?? an air flowenergy of blower instead of an electric motor most commonly used to a driven energy The analysis on the rotary cup speed. air velocity and air momentum with the blower conditions was performed and also the drop size was measured using LDPA. It was tried to analyzed on air-nozzle size and liquid feed-rate as the result. It was found that the increase of the relative velocity between liquid and air improve significantly atomization liquid. and decrease of the liquid feed-rate improved the maximum<br/> drop size though the mean drop size is really the same.<br/>

게잡이 원숭이에서 Recombinant Human Erythropoietin의 4주간 투여 후 비장 유전자 발현 연구

윤석주(Seokjoo Yoon),황지윤(Ji-Yoon Hwang),임정선(Jung-Sun Lim),정선영(Sun-Young Jeong),김용범(Yong-Bum Kim),김달현(Dal-Hyun Kim),권명상(Myung-Sang Kwon),한상섭(Sang-Seop Han),김충용(Choong-Yong Kim) 한국독성학회 2005 Toxicological Research Vol.21 No.3

We investigated effects of recombinant human erythropoietin (rHuEPO) on profiles of mRNA transcripts in 6 male cynomolgus (M. fascicularis) monkey’s spleen for 4 weeks. Six monkeys, composed of control and treatment group (Control : M1, M2, M3; Treatment : M4, M5, M6) were intravenously administered 3 times per week without or with a dose of rHuEPO 2730 IU/0.1 ㎖/㎏. After 4 weeks rHuEPO treatment, spleen was removed for RNA isolation. Splenic gene expression was assessed using Affymetrix U133A 2.0 arrays containing 18,400 transcripts and variants, including 14,500 well-characterized human genes. Gene expression pattern was very different between individuals even in same treatment. In rHuEPO treated groups showed number of genes were up-or downregulated (M4: 79; M5: 48; M6: 73 genes). Six genes (epidermal growth factor receptor, calgranulin A, estrogen receptor binding site associated antigen, matrix metalloproteinase 19, zinc finger and BTB domain containing 16, progestin and adipoQ receptor) were commonly expressed in rHuEPO treated group. The different individual response could be major considering factor in monkey experiment. Further study is needed to clarify the different individual response to rHuEPO in molecular level. This study will be valuable in the fundamental understanding and validation of molecular toxicology for biogeneric drugs including rHuEPO in cynomolgus monkey.

수업장학을 통한 초등학교 초임교사들의 수업전문성 향상에 대한 질적 탐구

윤석주(Yoon Seok-Ju) 고려대학교 교육문제연구소 2014 敎育問題硏究 Vol.27 No.3

본 연구의 목적은 초등학교 초임교사들이 수업장학을 통해 어떠한 수업전문성을 향상시키고 있는지 살펴보는 데에 있다. 이를 위해 연구자는 서울 소재 초등학교에 근무하는 초임교사 7명을 면담하였다. 본 연구 결과, 초임교사들은 수업장학을 통해 수업기술과 지식의 측면에서 그리고 수업에 대한 성찰 측면에서 수업전문성을 발달시켰다. 우선, 수업기술과 지식의 차원에서, 초임교사들은 수업장학을 통해서 학습자 수준에 대해 좀 더 배울 수 있었고, 어떻게 수업 전략을 짜야 유의미한 학습을 도출할 수 있는지 습득하였으며, 수업장학에서 배운 수업기술과 지식을 평상시 수업 때도 활용하였다. 두 번째로 수업에 대한 성찰 측면에서, 초임교사들은 수업장학을 통해 평상시 수업에 대해 다시 되돌아보고 자신의 수업을 다른 관점에서 바라볼 수 있었으며 "진짜" 좋은 수업이란 무엇인지 성찰해보는 기회를 갖게 되었다. This study investigated what beginning elementary school teachers learnt from supervision of instruction in the aspects of developing their professional development. The author interviewed seven teachers of three elementary schools at Seoul. She found that the supervision helped teachers improve their knowledge and skills for instruction and reflect on their teaching practice. First, they developed teaching strategies considering students' learning abilities, making learning more meaningful, later adapted the strategies getting from the supervision for daily instruction, and learnt how to prepare for this kind of supervision. Second, they reflected on their daily instruction: they recognized other perspectives of good instruction and began to contemplate what makes good instruction.

당뇨병에 합병된 결핵의 임상적 관찰

윤석주 ( Seok Ju Yoon ),이윤호 ( Yoon Ho Lee ),정승태 ( Seung Tae Chung ),남송현 ( Song Hyun Nam ),김응진 ( Eung Jin Kim ) 대한결핵 및 호흡기학회 1985 Tuberculosis and Respiratory Diseases Vol.32 No.2

고정 베인을 이용한 선회유동의 수치해석적 연구

윤석주(Suck ju Yoon),문평권(Pyeong gwon Moon) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.4

분무응용 기술 : 바이오 디젤의 수평분무 이미지 분석

윤석주 ( Suckju Yoon ),황창영 ( Changyeong Hwang ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-

This paper presents the possibility of bio-diesel which has high viscosity and oxygenated fuel by gun-type burner. The experiments were carried out for the comparison of the spray characteristics of the kerosene, lard, and soybean fuel injected from the pressure swirl nozzle of gun-type burner. The spray images were acquired by the high speed camera and changes of injection pressures and blending rate. In the horizontality direction spray different from vertical direction spray, the flow of single spray in downstream was found. This flow was appeared by the generation of primary spray and secondary spray. The primary spray has an influence of initial spray condition and secondary spray was shown by correlation of primary spray and nearby air.