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하주영,김주현,강봉순,Ha, Joo-Young,Kim, Joo-Hyun,Kang, Bong-Soon The Korea Institute of Information and Commucation 2006 한국정보통신학회논문지 Vol.10 No.3
본 논문은 개선된 Anti-cloche filter를 사용하는 SECAM video encoder와 오차가 없는 제곱근기와 BPF를 사용하는 SECAM video decoder를 제안하고자 한다. SECAM video encoder는 ITU-R BT.470에 의해 지정된 Anti-cloche filter를 사용하지만, Anti-cloche filter가 가지는 특성이 주파수에 따라 매우 급격히 변하기 때문에 디지털회로의 설계에 적용하기가 어렵다. 이러한 문제를 해결하기 위해서 본 논문에서는 Anti-cloche filter의 주파수 특성이 좌우대칭이라는 점을 이용하여서 좌우대칭의 중심이 되는 주파수인 4.286MHz를 0MHz로 이동하여 Anti-cloche filter를 High Pass Filter(HPF)로 변환한다. 변환된 HPF는 Anti-cloche filter에 비해 구조가 간단하기 때문에 설계가 비교적 용이하다. 또한 본 논문에서 제시한 SECAM video decoder는 주파수 변조된 신호로부터 색차신호(Db, Dr)를 복원하기 위해서 오차가 없는 제곱근기와 두 개의 미분기 그리고 삼각함수를 이용하여 색상신호의 잡음을 제거하고 CVBS(Composite Video Baseband Signal)로부터 색상신호와 밝기신호를 분리하기 위해서 BPF를 사용한다. 제안된 시스템은 Altera FPGA인 APEX20KE EP20K1000EBC652-3와 TV를 이용하여 실시간 검증을 수행하였다. In this raper, we propose the Sequentiel Couleur Avec Memoire or Sequential Color with Memory (SECAM) video encoder system using modified anti-cloche filters and the SECAM video decoder system using a band pass filter (BPF) and an error-free square root. The SECAM encoder requires an anti-cloche filter recommended by International Telecommunication Union-Recommendation (ITU-R) Broadcasting service Television (BT) 470. However, the design of the anti-cloche filter is difficult because the frequency response of the anti-cloche filter is very sharp around rejection-frequency area. So, we convert the filter into a hish pass filter (HPF) by shifting the rejection frequency of 4.286MHz to 0Hz frequency. The design of HPF becomes very easy, compared to that of the anti-cloche filter. The proposed decoder also uses an error-free square root, two differentiators and trigonometric functions to extract color-component information of Db and Dr accurately from frequency modulation (FM) signals in SECAM systems. Also, the BPF in decoder it used for removing color noise in chrominance and dividing CVBS into chrominance and luminance. The proposed systems are experimentally demonstrated with Altera FPGA APEX20KE EP20K1000EBC652-3 device and TV sets.
하주영 ( Ju Hyung Ha ),두안리엔 ( Du An L Ian ),루위 ( I Ru ),김윤성 ( Yun Sung Kim ),박영식 ( Young Seek Park ),김동석 ( Dong Seog Kim ) 대구가톨릭대학교 자연과학연구소 2012 자연과학연구논문집 Vol.10 No.1
The purpose of this study is to determination the optimum operating parameter(electric current, electrolyte type, electrolyte concentration, air flow rate, initial concentration of phenol)for degradation of phenol using electrochemical process. Analysis of non-biodegradable organic compounds was done by UV254 absorbance. The amount of phenol concentration was more decreased when the electric current amount, electrolyte concentration was increased. Nacl was found the most effective electrolyte for decreasing phenol concentration. However, air flow rate had no effect on the decreasing phenol concentration. The initial reaction rate was almost constant even though the phenol concentration was varied. Phenol and non-biodegradable were compared with degradation of time by COD measurement. The degradation of time was found long COD than phenol. The degradation time of phenol was required to remove intermediate, which was generated by decomposing phenol.
하주영 ( Ju Young Ha ) 이화여자대학교 간호과학연구소 2012 Health & Nursing Vol.24 No.2
Purpose: The purpose of this study was to identity the image of nurses and the level of career identity and the relationship between them in nursing students. Method: The subjects were 273 nursing students of P university in B city. Data were collected from March 6th to 12th, 2012 using a self-reported questionnaire. The collected data was analyzed with the SPSS win 18.0 statistics program. Result: The participants aged 18 to 30 years(mean: 19.81). The average score of image of nurses and career identity were 103.91 (score ranged of 28-140), and 35.92(score ranged 14-56), respectively. There was a significant difference in the image of nurses according to grade, college students` satisfaction of college entrance and current satisfaction with nursing. There was a significant difference in a career identity according to grade, religion, college students` satisfaction of college entrance and current satisfaction with nursing. Image of nurses was positively correlated with career identity. Conclusion: The findings of this study suggest that faculty should develop teaching strategies in order to enhance the positive image of nurses and the level of career identity for nursing students.
하주영 ( Ju-young Ha ),심보윤 ( Bo-yun Sim ) 부산대학교 간호과학연구소 2016 글로벌 건강과 간호 Vol.6 No.2
Purpose: The purpose of this study was to investigate the relationship between juvenile delinquency, cyber delinquency, and mental health among adolescents. Methods: Data were obtained from the 5th wave of the Korea Adolescence Welfare Panel Survey 2014. The subjects were 2,051 high school students. Results: Significant differences in gender and school type were found for offenders of both juvenile and cyber delinquency, while juvenile offenders also showed a significant difference in school characteristics. Significant correlations were also found between offenders of juvenile delinquency and victims of juvenile and cyber delinquency. Conclusion: Based on the study findings, self-esteem, life satisfaction, and peer attachment should be taken into consideration in prevention and management programs for juvenile delinquency and cyber delinquency in schools.