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이신후 ( Shin-hoo Lee ),김한석 ( Han-seok Kim ),이재영 ( Jae-young Lee ),권혁인 ( Hyeok-in Kwon ),이재춘 ( Jae-choon Lee ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
In this study, in order to evaluate the water purification performance of media filter using shell recycling, specific surface area and water purification experiments were performed after fabricating a filter medium mixed with fine oyster shell powder, zeolite, cement, water, and effective microorganims (EM). A comparative experiment was performed on the amount of change in specific surface area and BOD, SS, and T-P according to the blending amount of the media filter material. When zeolite was added to the media filter using shell recycling, the specific surface area increased, which was twice that of the meida filter using shell recycling without the addition of zeolite. In terms of water purification performance, the removal efficiency of SS and T-P was very high regardless of the type of media filter, but the BOD removal efficiency was different depending on the blending amount of the media filter. The BOD removal efficiency of MF-3 (120 g of fine oyster shell powder, 40 g of zeolite, 40 g of cement, 140 g of water and 10 g of EM based on 350 g) was 86.8 % after 3 and 4 weeks. So it is suitable for use. If the media filter using shell recycling is developed using the optimal blending amount of the media filter obtained in this experiment, it is expected that it can replace the existing media filter and become a new utilization method of the neglected shells.
이신후 ( Shin-hoo Lee ),김한석 ( Han-suk Kim ),이재영 ( Jae-young Lee ),이용운 ( Yong-woon Lee ),이재춘 ( Jae-choon Lee ) 한국환경기술학회 2023 한국환경기술학회지 Vol.24 No.2
A non-firing ceramic carrier with improved compressive strength was prepared and the physical properties of the carrier were compared and analyzed according to the drying method. In addition, the water treatment ability of the carrier was analyzed using Pilot-Plant. In order to prepare non-fired ceramic carriers, a total of 5 carriers were prepared by mixing zeolite and loess as main components, solid microorganisms, liquid microorganisms, perlite, waste shells, and activated carbon. It was found that the main components of the manufactured ceramic carrier were SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and CaO, and there was little cracking when drying at 80 ℃ through an oven during manufacture, and the required time was 1 day, which was economical. As a result of using S3 with high water treatment capacity and applying it to the Pilot-Plant, it was confirmed that the removal efficiency of T-N 70 %, T-P 80 %, Chl-a 80 %, and BOD 85 % exceeded the removal targets for each water pollutant. If developed using the manufacturing method of the non-fired ceramic carrier obtained in this experiment, it is considered that it can replace the existing fired ceramic carrier and can be used as a ceramic carrier with high economic efficiency through reduced firing cost.
Cyberbullying, Problematic Internet Use, and Psychopathologic Symptoms among Korean Youth
정영은,박태원,Bennett Leventhal,김영신,이신후,이명미,박선희,양종철,정영철,정상근,박종일 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.3
To evaluate the associations between cyberbullying behaviors and problematic internetuse, and to compare psychopathologic symptoms in victims, perpetrators, and victims-perpetrators of cyberbullying to those in youths who were not involvedin cyberbullying. A total of 4531 youths (11-14 years of age) were recruited from elementary and middle schools. Among 4531 youths, 9.7% were involved in cyberbullying; 3.3% were only victims; 3.4% were only perpetrators; and 3.0% were victims-perpetrators. Cyberbullying behaviors were associated with problematicinternet use as well as various psychopathologic symptoms. Depressive symptomswere associated with cyberbullying victimization, and rule-breaking behaviorsand aggressive behaviors have relevance to cyberbullying perpetration. Greater attention needs to be paid to identify youths earlier who are involved in cyberbullying and prevent serious adverse consequences in them.
인터넷 게임 중독에 있어서 초등학생 고학년군과 중학생군 간의 정서 및 행동특성의 차이
정현(Hyeon Jeong),박태원(Tae Won Park),이승옥(Seung-Ok Lee),이신후(Sin Hoo Lee),정상근(Sang-Keun Chung),정영철(Young-Chul Chung),양종철(Jong-Chul Yang),조은정(Eun Cheong Cho) 대한소아청소년정신의학회 2010 소아청소년정신의학 Vol.21 No.2
Objectives:This study was aimed at investigating the relationship between internet game addiction and emotional and behavioral characteristics of students both in the 5th and 6th grade of elementary school and in middle school. Methods:Two elementary schools and two middle schools were chosen to participate. The students completed selfreport questionnaires designed by the authors, called the Internet Game Addiction Scale, Korean youth self-report (K-YSR). Results:Compared to previous studies, the rates of those in the obvious game addiction group were much lower in this study. We defined the upper 10% of internet game addiction scores as a high risk user group and the lower 10% as a control group. There were significant differences between the groups with respect to the the ages at which internet gaming began, the frequency of game play per week, and the average length of each game playing session. Significant associations were also found between the level of internet game addiction and the withdrawn and delinquency subscales of the K-YSR. However, the association between game addiction and the withdrawn subscale was found only in middle school students. Conclusion:The findings from this study suggested that withdrawn and delinquent behaviors could be predictors of internet game addiction. Results also suggested the importance of early childhood intervention for preventing the development of more severe psychopathology in early adolescence.
청소년을 위한 스마트폰 과다사용 예방교육 프로그램 개발 및 예비효과연구
김명식(Myung Shig Kim),최은미(Eun Mi Choi),이신후(Jae Hong Bae),배재홍(Shin Hoo Lee) 한국IT서비스학회 2013 한국IT서비스학회지 Vol.12 No.4
This study developed the prevention education program of smartphone overuse for adolescents in middle school and testified its outcome. Finally the 4-session prevention education program for smartphone overuse was developed. 1st session was composed of psychoeducation about smartphone overuse and its side effect by quiz question. 2nd session smartphone addiction and brain change, 3rd session motivational enhancement program for smartphone overuse. 4th session cognitive behavioral program for it. The outcome was testified by internet addiction scale. smartphone addiction scale, and school adaptation scale for 2 classes of middle school students(experimental and control class). 2 Main results were as follows ; First, the smartphone addiction total score and cyberworld orientation of the students participating in it were statistically significantly reduced. The difficulty of daily living and abstinence symptom due to smartphone overuse of them tended to reduce. Second, internet addiction total and all subscores of them were not changed. Third, class adaptation of them was statistically significantly increased and school adaptation total score and teacher adaptation of them tended to increase. Its meaning, implication and limitation were discussed.
민화인 ( Hwa-in Min ),이재영 ( Jae-young Lee ),김민우 ( Min-woo Kim ),김한석 ( Han-seok Kim ),이신후 ( Shin-hoo Lee ),이기완 ( Ki-wan Lee ),이재춘 ( Jae-choon Lee ) 한국환경기술학회 2018 한국환경기술학회지 Vol.19 No.5
폐유지(동물성, 식물성)를 이용하여 산업용 천연 계면활성제를 제조하였으며, 제조된 산업용 세척제의 유해성 및 성능평가를 실시하였다. 산업용 세척제에 대한 중금속 분석결과 As 0.022 mg/L, Pb 0.429 mg/L로 나타나 인체에 무해할 것으로 판단되며, 형광증백제와 메틸알콜의 분석결과 불검출과 1.0 mg/L기준이하로 측정되었다. 타사의 산업용 세척제와 세척력을 비교분석한 결과 합성계면활성제와 동등하게 나타났다. 부식성 분석결과는 철, 스테인리스스틸, 알루미늄의 시편 모두에서 부식이 되지 않은 것으로 나타나 금속기계류의 세척제로 사용가능할 것으로 판단된다. 또한, 생분해도 분석결과는 합성세제의 생분해도 기준인 90보다 높은 93으로 분석되었다. 세척제 KS규격 평가항목으로 분석한 결과 모든 항목에서 우수한 성능을 보여 석유계 합성계면활성제를 대체할 수 있을 것으로 판단된다. Industrial surfactant was prepared by using waste cooking oil(animal, vegetable), and the harmfulness and performance of the manufactured industrial detergent were evaluated. As a result of heavy metal analysis on industrial detergents, As 0.022 mg/L and Pb 0.429 mg/L were considered to be harmless to human body. Fluorescence brightener and methyl alcohol were not detected and measured below 1.0 mg/L. The comparative analysis of the industrial detergents and cleaning powers of other companies showed that they were equivalent to synthetic surfactants. Corrosion analysis showed that all samples of iron, stainless steel and aluminum were not corroded and could be used as a cleaning agent for metal machinery. Also, the biodegradation analysis result was analyzed to be 93, which is higher than 90, which is the biodegradation standard of synthetic detergent. Analysis of the detergent KS standard endpoint is determined to be able to replace the petroleum-based synthetic surfactant performed well in all the items.