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音聲 카세트 녹음기를 利用한 高速 記憶 裝置의 製作에 관한 硏究
李壽東 陸軍士官學校 1980 한국군사학논집 Vol.20 No.-
An auxiliary storage device is designed using audio cassette tape recorder. Hardwere, which can record phase-encoded data and reproduce them at 4,800 Baud Rate, is implemented and software provides a format on the magnetic tape to process data at each block. As this system contains high accuracy and efficiency comparatively, it can be interfaced with microcomputer and uses for development of other systems.
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택지개발지구에서의 비오톱 평가에 기초한 환경생태계획 기법 연구
이수동,Lee, Soo-Dong 한국조경학회 2007 韓國造景學會誌 Vol.34 No.6
Since 1990, urban areas have been expanded rapidly due to the concentration of the population and several development projects including large scale apartment complexes and residential developments. Due to these development projects, the quality and functions of ecosystems have been continuously degraded, regardless of public agencies' efforts introducing development index, guideline, and amendment of law for sustaining the quality of ecosystems. Substantial guideline and content cannot expect the sustainable maintenance of nation's natural resources. Recent improve this situation, ecological planning was introduced, but research data of environments and objective systems were not enough showing the limits. The purposes of this study were to reduce the urban sprawl caused by residential development plans for environment-friendly residential developments, to establish applicable ecological planning, and to suggest the land use plans that reduce adverse effects of developments to nature ecosystem.
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확장 합성곱 신경망과 자기 지도 순환 적대적 생성 신경망을 이용한 안개 제거 네트워크
이수동,황선희,최영우,변혜란 한국정보과학회 2020 정보과학회 컴퓨팅의 실제 논문지 Vol.26 No.2
The purpose of this study is to investigate methods restoring hazy images to haze-free images. Most dehazing studies have used datasets that consist of pairs of images, one hazy and one haze-free of the same scene, for training purposes. However, in the real world, it is almost impossible to acquire this kind of data where the hazy image and the haze-free image are perfectly matched except for the haze. Therefore, this paper aims to develop a network that removes haze using hazy images and images without haze that are not paired. The proposed model uses the CycleGAN architecture with this unpaired data. In order to improve the haze removal performance, we propose a dehazing model consisting of a smoothed dilated convolution, a perceptual loss function and a rotational loss function under self-supervised learning. For objective performance evaluation of the proposed techniques, we conducted experiments on the D-HAZY dataset and with real hazy images. The performance of the proposed method was demonstrated through qualitative and quantitative analysis. C/C++의 타입 캐스팅은 취약점을 유발하며 프로그램의 안정성을 저하시킨다. 이를 보완하기 위해 C++에서는 실행 중 객체의 타입을 확인하여 캐스팅하는 dynamic_cast를 지원하지만, 안전성이 높아지는 대신 실행 속도가 느려진다는 단점이 있다. 이러한 이유로 절충안인 런타임 오버헤드가 적은 static_cast가 사용된다. 그러나 static_cast는 컴파일시에 알려진 타입으로만 캐스팅을 제한하는 방법으로서, 취약점이 여전히 존재한다. 본 논문에서는 프로그램 재작성과 타입 시스템을 활용하여 기존의 C++ static_cast를 보완하여 런타임 오버헤드가 적으면서도 개발 단계에서 좀 더 안전한 코딩을 할 수 있도록 유도하는 방법을 제안한다.
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이수동 대한영상의학회 1986 대한영상의학회지 Vol.22 No.3
The differentiation between lung abscess and empyema can be difficult, but has important therapeutic consequences. Thoracostomy tube drainage is essential therapy for an empyema, whereas prolonged antibiotic therapy and postural drainage often suffice for a lung abscess. Conventional radiographic findings are usually relied on to help make correct differentiation between empyema and lung abscess. but overlying lung disease or unfavorable location of lesion often results in ambiguous findings. Although ultrasound has proved useful in differentiating empyema from lung abscess, CT is best accurate diagnostic method. Authors reviewed chest CT of 50 cases(41 empyemas, 9 lung abscesses)which were diagnosed by surgery or clinical background during the period from May 1980 at Dongsan Medical Center, Keimyung University. The results were as follows : 1) Age and sex distribution a)Empyema : The incidence was most common in the 6th and 7th decades. Male to female ratio was 3 : 1 b) Lung bscess : The incidence was most common in the 5 th, 6 th and 7th decades. Male to female ration was 2 : 1 2) Wall characteristics (empyema 32 cases, lung abscess 9 cases ) : The 9 cases of 41 empyemas had not defined their walls. a) Empyema had at least a part of their wall that was thin (81%) uniform width(84%), and smooth on both margins (more than 96%), b) The wall of lung abscess was thick (89%), irregular width(89%), and irregular margins(100%). 3) Separation of uniformly thickened visceral pleural from parietal plura ("spite plura" sign) was seen only in 68 % of all empyemas. 4) adjacent lung compression was seen only in 88% of all empyemas. 5) Chest wall angle : In 78 % of all empyemas had obtuse or mixed angles. whereas in 85% of all lung abscesses had acute angle. 6) Shape of lesion : Empyema had variant shapes from round to crescent, however all lung abscesses had roung ovoid shape. 7) Size of lesion : empyema had medium (41%) or large (44%) size, but the lung abscess had o ly small (33%) or medium (67%) size. 8) Air in lesion was seen in 41% empyemas and in 89% lung abscesses. 9)Adjacent lung consolidation showed in 34% empyemas and in all lung abscesses. 10) Free pleural fluid was seen in 12% empyemas and in 89% lung abscesses. 11) Sepated lesions were seen in 32% empyemas and in 56% lung abscess. 12) Multiple lesions were seen in 44% empyemas and in 55% lung abscesses. 13)Mediastinal shifting was seen in 49% empyemas and I 44% lung abscesses. but which all lung abscesses were coexisted with empyemas. 14) Pleural caldification was seen only in 5 cases(12%) of all empyemas. 15) Location of lesion : Most (93%) of empyemas were located in posterolateral portion of hemithorax, and most (78%) of lung abscesses involved in right lower lobe.ower lobe.
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이수동,전치혁 대한산업공학회 2013 대한산업공학회 춘계학술대회논문집 Vol.2013 No.5
Structural Equation Modeling (SEM) is a class of methods that seeks to represent hypothesized relationships among latent variables and manifest variables in terms of parameters defined in a conceptual structure. SEM has a limitation that latent variables and the relationship structure between variables are solely built by researchers rather than from data. To resolve the problem, a method to extract latent variables and relationship structure out of observed data is proposed. For latent variable extraction, variable clustering using principal component analysis (PCA) is conducted. Then, the structure including the extracted latent variables are constructed by the causal discovery using Bayesian networks. Through an experiment using synthetic data, the method is validated.
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