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코로나 플라즈마 처리에 의한 HDPE 표면의 개질에 관한 연구
최진숙,전종탁,정봉규,이근대,문명준,이종무 釜慶大學校 2001 釜慶大學校 論文集 Vol.6 No.-
We are able to generate the stable plasma in open air and nitrogen using a corona plasma treatment system(CPTS) with a high voltage. This was applied to treat the surface of rather non-polar HDPE(High Density Polyethylene) intended for the improvement of adhesion of over-coated layers such as coatings, printing inks. The surface tension of HDPE was significantly improved by the CPTS. The characteristics of surface layer were evaluated by means of contact angle measurement, ATR-FT/IR spectroscopy, and it was found that functional groups were introduced into the surface layer of the HDPE. The use of nitrogen was increased the surface tension of the HDPE from 33.8 mJ/m^2 to 66.56 mJ/m^2, and highly effective method of HDPE surface modification could be realized.
裵鍾淳,金成浩,崔震宇,姜秉卓 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-
Load distribution in group piles is an important matter of consequence for the safe design and the economical design. In the group piles, the model tests were to investigate the effects on spacing-to-diameter ratio of pile, number of piles and arrangement of the pile. The tops of pile were all set to rotate freely. This paper considered the load distribution by the location of the pile as compared the behavior of group piles with single pile. For a three row pile group at 3D spacing, the measured individual row distributions were 35~38%(lead), 32∼34%(middle) and 27∼30%(tail). This results were compared very favorably to those by McVay et al(1995). The shadowing effect for the parallel direction of lateral loading appears to be more significant than the one for the perpendicular direction of lateral loading.
Choi, Youn-Jin,Lee, Ahwon,Kim, Tae-Jung,Jin, Hyun-Tak,Seo, Yong-Bok,Park, Jong-Sup,Lee, Sung-Jong Asian Society of Gynecologic Oncology; Korean Soci 2018 Journal of Gynecologic Oncology Vol.29 No.3
<P><B>Objective</B></P><P>Human papillomavirus (HPV) 16 is the most carcinogenic HPV genotype. We investigated if HPV16 L1 capsid protein and E2/E6 ratio, evaluated by cervical cytology, may be used as biomarkers of ≥cervical intraepithelial neoplasia (CIN) 2 lesions.</P><P><B>Methods</B></P><P>Cervical specimens were obtained from 226 patients with HPV16 single infection. Using cytology specimen, L1 capsid protein and E2/E6 ratio were detected and the results were compared with those of the conventional histologic analysis of cervical tissues (CIN1–3 and squamous cell carcinoma [SCC]) to evaluate the association.</P><P><B>Results</B></P><P>The L1 positivity of CIN2/3 was significantly lower than that of normal cervical tissue (p<0.001) and SCC demonstrated significantly lower L1 positivity than CIN1 (p<0.001). The mean E2/E6 ratios of specimens graded as SCC (0.356) and CIN2/3 (0.483) were significantly lower than those of specimens graded as CIN1 (0.786) and normal (0.793) (p<0.05). We observed that area under the receiver operating characteristic curve (AUC) for E2/E6 ratio (0.844; 95% confidence interval [CI]=0.793–0.895) was higher than that for L1 immunochemistry (0.636; 95% CI=0.562–0.711). A combination of E2/E6 ratio and L1 immunocytochemistry analyses showed the highest AUC (0.871; 95% CI=0.826–0.917) for the prediction of ≥CIN2 lesions.</P><P><B>Conclusion</B></P><P>To our knowledge, this is the first study to validate HPV L1 capsid protein expression and decreased HPV E2/E6 ratio as valuable predictive markers of ≥CIN2 cervical lesions. Cervical cytology may be analyzed longitudinally on an outpatient basis with noninvasive procedures as against invasive conventional histologic analysis.</P>
Single Sign-On을 이용한 인증 관리 기법에 관한 연구
최진탁(Jin-Tak Choi) 한국산업응용수학회 2006 Journal of the Korean Society for Industrial and A Vol.10 No.1
단 한 번의 인증으로 여러 시스템을 자유롭게 사용할 수 있는 SSO(Single Sign-On)기술은 단일 인증이라는 편이성과 최근 PKI기반의 강력한 보안 기능까지 갖추게 되어 기업에게 주목 받는 대상이 되었다. 최근에는 SSO기술을 기반으로 한 EAM이라는 권한관리 시스템이 등장하여 현재의 기업 IT 인프라 시스템의 효율성과 안정성을 증대시켰다. 본 논문에서는 SSO 기본 개념과 기존 SSO시스템의 특징을 분석하고, 다중 순환자를 통해 인증시 부하를 분산시킨 PKI 기반의 SSO 모델을 제안한다. SSO (Single Sign On), which allows users to have an access to a various systems through a single authentication, has been receiving much attention from many enterprises due to the user convience through a single authentication and the recent security features based on PKI. An emerging authentication management system called EAM has further enhanced the efficiency and stability of the enterprise IT infrastructrure systems. In this article, the basic concept and characteristics of the existing SSO sytems are analyzed and a new SSO model, based on PKI where authentication load is balanced via multiple circulators, is presented.
지상 초분광영상을 이용한 배추의 노균병 조기검출을 위한 딥러닝 모델 개발
안디탸스리다마르프라티아스타 ( Anditya Sridamar Pratyasta ),루카스위쿠쿠스위디얀토 ( Lukas Wiku Kuswidiyanto ),노현호 ( Hyun Ho Noh ),정희영 ( Hee-young Jung ),한웅철 ( Xiongzhe Han ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.2
The main economic threat to Chinese cabbage producers in Korea is downy mildew on Brassica rapa. Affected leaves have become less valuable, and the Chinese cabbage which invaded are troublesome because symptom can occur and spreads rapidly wherever brassica crops are grown. Early identification with hyperspectral imaging approaches for downy mildew may potentially assist producers in identifying infection before apparent symptoms arise that are marked with unusual yellow to light brown patches on the top leaf area. Hyperspectral imaging (HSI) detects leaf disease in a sensitive and wide range of spectral wavelengths, and it is a broad field applicable. This study employed hyperspectral imagery focused on crops in the pots to gather high-resolution hyperspectral data and identify downy mildew at the early asymptomatic phases. Downy mildew spectral profiles are obtained from calibrated and preprocessed hyperspectral images. A deep learning Convolutional Neural Network (CNN) model is established to distinguish spatial and spectra patterns between healthy and diseased plants from hyperspectral image data series. The developed model is expected to achieve 90% accuracy and can be used to support the development of aerial hyperspectral imagery.