Risk Factors for Predicting New-Onset Atrial Fibrillation in Persons Who Received Health Screening Tests

김학진,온영근,성지동,김준형,송영빈,이왕수,최진오,신대희,최성원,최재혁,한주용,김준수 대한심장학회 2007 Korean Circulation Journal Vol.37 No.12

Background and Objectives : Atrial fibrillation (AF) is the most common significant arrhythmia in the general population, and it is associated with increased cardiovascular morbidity and mortality. The incidence of and the risk factors for new- Subjects and Methods : We retrospectively analyzed 16,568 adults (median age 49 years, 10,685 males and 5,883 females) who had repeatedly received scree-ning tests for general health at the Health Promotion Center, Samsung Medical Center in Korea betwen March, 2001 and June, 206 (mean follow up duration: 44 months). Results: Sixty one cases had new-onset AF noted on the electrocardiogram (ECG). On the univariate analysis, age, male gender, a history of coronary artery disease and fibrinogen, and left atrium enlargement sen on ECG at baseline were significantly asociated with new-onset AF. After multivariable adjustment, the independent risk factors for predicting new-onset AF were male gender [odds ratio (OR): 3.356, 95% confidence interval (CI): 1.168-9.643, p= 0.025] and a history of coronary artery disease (OR: 4.657, 95% CI: 1.703-12.737, p= 0.003). Conclusion : The risk factors for predicting new-onset AF in persons who (Korean Circ J 2007 ;37:609-615)

자율주행 농기계 기술 연구

김학진,김정훈 대한기계학회 2018 기계저널 Vol.58 No.4

"Orange Juice통조림 중의 Sn의 溶出量"

金學辰 漢陽大學校文理科大學 化學科 1970 化脈 Vol.- No.1

市販 Orange Juice통조림 80個의 Sn溶出量의 측정을 Polarograph法으로 行하였다. 그 結果 150ppm을 超過한 통조림도 있었다. 다른 조건하에서 준비된 見本을 주의깊게 使用함으로서 Sn의 溶出量을 測定을 하였다. Sn의 溶解中에 중요한 變化는 아래와 같은 變化物에 依해서만 惹起되는것은 아니다. (1)Vitamin C의 添加의 量 (2)통조림 充電時의 溫度條作 (3)製造後의 저장중의 變化 Sn의 농도가 150ppm 以下라면 Sn의 溶解되어 있는 量과 우리가 먹어서 배설하는 정도로서 人體에 害가 되는 뚜렷한 상호 關係는 아니다.

비핵심어 모델의 가중치 기반 핵심어 검출 성능 향상에 관한 연구

김학진,김순협,Kim, Hack-Jin,Kim, Soon-Hyub 한국정보처리학회 2003 정보처리학회논문지B Vol.10 No.4

본 논문에서는 핵심어 검출기의 성능 향상을 위해 가베지 클라스 클러스터링과 함께 필러 모델에 가중치론 부여하는 방안 및 태스크 도메인 이용자들의 발화 음성의 성향 분석을 통해 핵심어 천이 확률을 계산하여 핵심어 검출기반 대화 음성처리 시스템의 처리 시간 단축 방안을 제안한다. 제안한 방법은 음성학적으로 유사한 음소끼리 묶어서 사용함으로써 하나의 음소는 잘 표현하지 못하지만 비슷한 음소 그룹의 표현에는 유용한 방법으로 본 논문에서는 한국어 형태론과 태스크 도메인으로 선정한 증권거래 대화음성처리 시스템에서 활용되는 발화 문장을 분석하여 5 음소군을 제시한다. 또한 이들 음소군에 태스크 종속적인 필러 모델 가중치를 부여하며, 두 번째로는 시스템의 처리시간 단축을 위해 연속 발화 문장 속에 포함되어 있는 핵심어 천이 확률을 계산하여 시스템에 적용 실험한다. 제안한 시스템의 성능 평가를 위해 태스크 도메인에 활용되는 4,970 문장의 코퍼스를 구축하고, 이용자 중 20대∼30대 5명이 발성하게 하여 실험한 결과, 제안한 5 음소군에 가중치를 부여한 방법의 FOM은 87.5%로 Yapanel[1]의 7음소군 85.5%보다 우수한 성능을 보였으나, LVCSR의 89.8%보다는 약간 뒤지는 성능을 확인하였다. 계산시간에 있어서도 0.70초로 7음소군의 0.72초보다 우수한 성능을 보였다. 핵심어 천이 확률 분석을 통한 인식 시간 단축 실험에서는 천이 확률을 적용했을 때 약 0.04초∼0.07초의 처리 시간을 단축하는 것을 확인하였다. This paper presents a method of giving weights to garbage class clustering and Filler model to improve performance of keyword spotting system and a time-saving method of dialogue speech processing system for keyword spotting by calculating keyword transition probability through speech analysis of task domain users. The point of the method is grouping phonemes with phonetic similarities, which is effective in sensing similar phoneme groups rather than individual phonemes, and the paper aims to suggest five groups of phonemes obtained from the analysis of speech sentences in use in Korean morphology and in stock-trading speech processing system. Besides, task-subject Filler model weights are added to the phoneme groups, and keyword transition probability included in consecutive speech sentences is calculated and applied to the system in order to save time for system processing. To evaluate performance of the suggested system, corpus of 4,970 sentences was built to be used in task domains and a test was conducted with subjects of five people in their twenties and thirties. As a result, FOM with the weights on proposed five phoneme groups accounts for 85%, which has better performance than seven phoneme groups of Yapanel [1] with 88.5% and a little bit poorer performance than LVCSR with 89.8%. Even in calculation time, FOM reaches 0.70 seconds than 0.72 of seven phoneme groups. Lastly, it is also confirmed in a time-saving test that time is saved by 0.04 to 0.07 seconds when keyword transition probability is applied.

Simulations of Two-Dimensional Electronic Correlation Spectra

김학진,전성준,Kim, Hak Jin,Jeon, Seong Jun Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.8

Two-dimensional (2D) correlation method, which generates the synchronous and the asynchronous 2D spectrum by complex cross correlation of the Fourier transformed spectra, is an analysis method for the changes of the sample spectrum induced by vari ous perturbations. In the present work, the 2D electronic correlation spectra have been simulated for the cases where the sample spectrum composed of two gaussian bands changes linearly. When only the band amplitudes of the sample spectrum change, the synchronous spectrum shows strong peaks at the band centers of the sample spectrum, but the asynchronous spectrum does not make peaks. When the sample spectrum shifts without changing intensity and width, the synchronous spectrum shows peaks around the initial and final positions of the band maximum and the asynchronous spectrum shows long peaks spanning the shifting range. The band width change produces the complex 2D correlation spectra. When the sample spectrum shifts with band broadening, the width change by 50% of full width at half maximum (FWHM) does not give so large an effect on the correlation spectrum as the spectral shift by one half of FWHM of the sample spectrum.

철근콘크리트 실험체의 시스템 식별 결과를 이용한 유한요소모델수정

김학진,유은종,김호근,이상현 단국대 부설 리모델링연구소 2008 리모델링 연구소 논문집 Vol.6 No.2

This paper focused on the application of finite element model updating technique to evaluate the structural properties of the reinforced concrete specimen using the data collected from shaking table tests. The specimen was subjected to six El Centro(NS, 1942) ground motion histories with different Peak Ground Acceleration(PGA) ranging from 0.06g to 0.50g. For model updating, flexural stiffness values of structural members(walls and slabs) were chosen as the updating parameters so that the converged results have direct physical interpretations. Initial values for finite element model were determined from the member dimensions and material properties. Frequency response functions(i.e. transfer functions), natural frequencies and mode shapes were obtained using the acceleration measurement at each floor and given ground acceleration history. The weighting factors were used to account for the relative confidence in different types of inputs for updating(i.e. transfer function and natural frequencies). The constraints based on upper/lower bound of parameters and sensitivity-based constraints were implemented to the updating procedure in this study using standard bounded variable least-squares(BVLS) method. The veracity of the updated finite element model was investigated by comparing the predicted and measured responses. The results indicated that the updated model replicates the dynamic behavior of the specimens reasonably well. At each stage of shaking, severity of damage that results from cracking of the reinforced concrete member was quantified from the updated parameters(i.e. flexural stiffness values).

청음 음성학적 지식에 기반한 음가분류에 의한 핵심어 검출 시스템 구현

김학진,김순협 한국정보처리학회 2003 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.10 No.2

아집은 이제 그만

김학진 釜山醫師會 1985 釜山醫師會誌 Vol.21 No.4

가토에서 99.9% 에탄올을 이용한 화학적 담낭 경화법에 관한 연구

김학진,이광만,채권묵 圓光大學校 醫科學硏究所 1992 圓光醫科學 Vol.8 No.1-2

Chemical sclerosis of the gallbladder was attempted using 99.9% ethanol in 13 rabbits at laparotomy. This study was performed to observe the obliteration and fibrosis of the gallbladder after exposure to chemical sclerosant without operative cholecystectomy. The proximal cystic duct was occluded by vascular clamps, and then 99.9% ethanol was injected to the gallbladder, followed by aspiration of ethanol after 10min (4 rabbits), 20min (5 rabbits). Biopsies of the gallbladder were performed after 1 week and 2 weeks in 9 rabbits (twice for each rabbits), and after 3 weeks in remaining 4 rabbits. The gallbladder specimens were examined grossly and microscopically to observe the degree and extent of necrosis and fibrosis related to the ethanol-exposure time and the interval between the time of the ethanol-exposure and biopsy. The results were as follows. 1. Cystic duct occlusions were observed at 1 week after ethanol-exposure in all rabbits, and there were no gross changes of the liver and the common bile duct. 2. The specimen of the liver showed no remarkable microscopic change, and the titers of liver function test (AST, ALT and r-GTP) were in normal limit in all rabbits after ethanol-exposure. 3. Microscopic examination of the wall of the gallbladder after 1 week showed ischemic necrosis of entire layer in all rabbits, but inflammation or fibrosis was not observed. 4. After 2 weeks, the serosal layer of the gallbladder showed fibrosis with infiltration of fibroblasts in all rabbits, and the fibrosis was more progressed after 3 weeks with proliferating fibroblasts.

特異한 下腿骨 發育不全症의 1例

金學辰,朴己出 대한의학협회 1968 대한의학협회지 Vol.11 No.3