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곽정란,이점임,이훈재 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)
In this paper, We propose an improved A5 stream cipher for a GSM data security. As the conventional A5 stream cipher has been analyzed in having a weakness of the 64-bit key length, we enlarge the key length of it twice (128-bit). As a result, we analyze the random property, period and linear complexity of the output sequence. Finally, We simulate the improved algorithm by C-language.
호흡율 측정기를 이용한 폐수의 외부탄소원 이용가능성 평가
최은희,고주형,임정훈,부경민,김창원 부산대학교 환경문제연구소 2000 環境硏究報 Vol.18 No.-
In this research, we measured Readily Biodegradable COD(Ss) using respiration meter which measured OUR and calculated respiration rate due to calculate organic matter portion of external carbon sources because known organic matter analysis methods i.e. COD, BOD did not measure amount of organic matter which was used in denitrification. Based on the experimental results, leather wastewater had 40.3% Ss in TCOD and food fermentation liquid, alcoholic wastewater and petrochemical wastewater was 38%, 38% and 28.3% respectively. However in case of considering of flowrate and concentration, flood fermentation and alcoholic wastewater was revealed that they were effective external carbon sources
2차원 및 3차원 초음파를 이용한 태아표면의 해부학적 선별 검사에 관한 연구
윤석범,이해혁,이정재,최경훈,이순곤,이임순,이권해 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2
Objective : Our purpose of this study was to determine the clarity and consuming time of fetal surface screening in thirty-eight fetuses from 24 to 32 weeks of gestation by use of two and three-dimensional ultrasonography. Methods : From May 1998 to July 1998, we performed the fetal surface screening of the fetal face, extremities, and spine. Thirty-eight fetuses of 24-32 weeks of gestation (thirty-seven normal fetuses and one abnormal fetus) were studied by use two-dimensional (AI 5200S, 3.5-5.0MHz; Acoustic Imaging Technologic Cooperation, U.S.A.) and three-dimensional ultrasonography (Volusion 530D, 3.5-5.0 MHz ; Kretz-Medicine, Korea). On the fetal face, we evaluated both orbits, nose, lips and brow. Both hands and feet, five digits and toes should be seen in this study. We evaluated cervical spine and lumbosacral junction of the spine. Results : The maternal average age of 38 patients was 29.9 years and the average gestational age was 29.7 weeks. The results of fetal surface screening were as follows : face (both orbits 89.5%, lips 92.1%, nose 92.1%, and brow 89.5%), extremities (both hands 68.4% and feet 73.7%), and spine (cervical spine 94.7% and lumbosacral junction 97.4%) by use of two-dimensional ultrasonography. By use of three-dimensional ultrasonography, results were as follows : face (both orbits 76.3%, lips 81.6%, nose 81.6%, and brow 78.9%), extremities (both hands 76.3% and feet 78.9%), and spine (cervical spine 71.1% and lumbosacral junction 73.7%). Consuming time for two-dimensional ultrasonography were 4.7 minutes for face, 11.6 minutes for extremities, and 5.7 minutes for spine. Using three-dimensional ultrasonography results were 12.8 minutes for face, 17.9 minutes for extremities, and 11.7 minutes for spine. Average consuming time of all fetal anatomic screening was 22.0 and 42.4 minutes by use of two and three dimensional ultrasonography. In one abnormal fetus had cleft lip and polydactyly of right foot which were detected all by three-dimensional ultrasonography, but we couldn't detect the polydactyly by two-dimensional ultrasonography. Conclusion : Three-dimensional ultrasonography was more time-consuming method, but we suggested that three-dimensional ultrasonography was superior than two-dimensional ultrasonography in fetal surface screening.
어머니 취업 및 직업만족도와 아동이 지각한 자녀양육태도와의 관계 연구
송정은,윤계훈,윤정현,이정임,장정선,장현숙,최성혜,최영옥 연세대학교 생활과학대학 1988 婦學 Vol.21 No.-
The purpose of this study was to investigate the relationship between child perception of mother's rearing attitude and mother's employment status, and mother's job satisfaction. The subjects were 225 fifth graders and 70 employed mothers and 155 unemployed mothers selected from 2 primary schools located in a low income residential area in Seoul. The instruments used were a questionnaire about mother's child rearing attitude by Kim, Kyung-Hee, et al(1976) and 12 questions selected from Thomson's test of mother's satisfaction on her employment(1980) translated by Park, He-Ryung(1986). Data were analyzed by Chi-square and t-test. The resulting showed no significant statistical differences on the perception of mother rearing attitudes either as a function of mother's employment status or her job satisfaction. It was concluded that the child rearing attitude of low income mothers was not affected by the mother's employment status or job satisfaction.
임철훈(Im Cheol Hoon),이동연(Lee Dong Yeon),정동원(Jeong Dong Won),조민수(Jo Min Su),이승주(Lee Seung Ju),정용민(Jeong Yong Min) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7
코로나19 발생 이후 마스크 착용과 손 소독은 자신과 주변 사람들을 위해 매우 중요 해졌다. 이를 위해 설계된 돈 터치! (Don't Touch!)는 기존의 방역수칙들을 하나의 기기를 통해 완료할 수 있게 제작되었다. ‘mblock’ 프로그램 내부에 Machine Learning을 통해 마스크를 착용하였는지 확인하는 프로그램을 만들었고, 체온의 측정과 손 소독제 분사가 이루어진 후 자동문이 열리게 되는 부분들을 연결시켜 하나의 시스템으로 만들었다.