Removal of Cochlodinium polykrikoides using a novel material produced from sediment - A field study

Young一Chae Song,S. Sivakumar,Sung-Chung Ko,Eung-Ju Hwang,Qtae Jo 한국항해항만학회 2007 한국항해항만학회 학술대회논문집 Vol.2 No.추계

The present study was conducted in three fields at Namhae to examine the removal efficiency of organic free, heavy metal immobilized sediment on Cochlodinium polykrikoidesand on sea water quality. The present study results concluded that removal efficiency was depends on the initial number of red tide cells. There was no drastic change in the sea water quality after sediment spray. For the comparison of effectiveness of betonite, zeolite and lime were mixed with sediment did not show any marked difference in removal. Finally, the present study evaluated 5Og/m² sediment is Sufficient to remove 100% cells density, even though various environmental factors are interfering the mechanism.

채소류에 살포된 유기인제 농약 잔류성분의 경시적 변화

송낙수,조영채 忠南大學校 環境問題硏究所 1999 環境硏究 Vol.17 No.-

In order to investigated the changes of the time dependence in vegetable for organophosphorous pesticide, fenitrothion and chlorpyrifos were sprayed on the lettuce, perilla leaves, pepper and cherry tomato cultivated in vinyl house andopen-field, respectively. The safe use guideline at the pesticide application was obeyed. After fenitrothion and chlorpyrifos were sprayed, residual components of pesticides were analyzed by gas chromatography according to the change of time dependence, that is, 3hrs, 3, 7, 14, 21 and 28 days. The obtained results were summarized as follows. Residual components of pesticides of leaf vegetable, such as lettuces and perilla leaves were rapidly decreased with time sequence than that of fruit vegetable, such as red pepper and cherry tomato. Residual components of pesticides were rapidly decreased with vegetables cultivated in open-field than that of vinyl house. The concentration of fenitrothion and chlorpyrifos were sprayed in vinyl house and open-field were significantly decreased according to the time lapse(p<0.001). Decomposition rate of residual pesticide was more rapidly decreased at within 7 days but it was slowly decreased the day after 2∼4 weeks. Above results indicate the safe use guideline at pesticide application must be obeyed and cleaning was surely needed.

일부 농촌지역 주민의 모발중 금속 농도 분포

고현송,심운택,조영채 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.2

In order to know the concentration of some metals in human hairs from residents living in rural area, the 88 hair samples were taken from Kunbuk-Myon residents during the period from August through October, 1990. The 4 elements(Pb, Cd, Mn, and Zn) in human hair were determined by atomic absorption spectrophotomer with flame and grapite furnace atomizer systems using wet ashing procedure. The results were as follows: 1. The mean concentrations of metals in human hair of the total 88 samples were: Pb was 3.14±1.63㎍/g, Cd was 0.81±0.71㎍/g, Mn was 4.02±3.86㎍/g, Zn was 199.11± 80.33㎍/g, and in the males: Pb was 3.51±1.54㎍/g, Cd was 0.84±0.63㎍/g, Mn was 3.95±4.78㎍/g, Zn was 215.88±76.76㎍/g, and in the females: Pb was 3.34±1.69㎍/g, Cd was 0.79±0.77㎍/g, Mn was 4.08±2.95㎍/g, Zn was 186.36±82.90㎍/g 2. There were no significant differences among 4 elements (Pb, Cd, Mn, Zn) by Age groups, by exposed to pesticides and by exposed years to pesticides. 3. In males, there were negative correlation between age and Cd level(r=-0.2860, P<0.05), between Cd and Zn(r=-0.3760, P<0.01), and significant positive correlations between Pb and Zn(r=0.2881, P<0.05). In females, there was significant positive correlations between Pb and Zn(r=0.3096, P<0.01).3 4. There were positive correlations between Pb and Cd(r=0.1835, P<0.05) and between Zn and Pb(r=0.3049, P<0.01), but there was negative correlation between Mn and Cd(r=-0.1817, P<0.05).

일부 고등학생들의 일상생활특성에 따른 스트레스와 피로자각증상의 평가

이주영,송인순,정용준,조영채 韓國學校保健學會 2003 韓國學校保健學會誌 Vol.16 No.1

The present study was designed to evaluate the factors influential on stress and subjective fatigue symptoms based on school life environments and daily life style among high school students. The self-administered questionnaires were delivered to 2,381 high school students of both sexes in Taejon metropolitan city during the period from Mar. 1st to Jun. 30th, 2000. The analysis of study results revealed the following findings: 1. According to the magnitude of stress, the normal subjects were 3.1%, the groups with potential stress were 64.7%, and the groups at high risk for stress were 32.2%. Higher level of stress existed in the female than the male students, and in the third grader than the 1st and 2nd graders. According to the classification of typical constitutional symptoms of fatigue, categoryⅢ (group with difficulty in concentration) and categoryⅠ(group with dullness and sleepiness) in a decreasing order of frequency, which showed that the predominant pattern of fatigue arose from the body parts. 2. With regard to the school life characteristics and stress scores, the higher cores of stress were shown in the groups with the lower grades, with worse friend's relation and with the lower satisfaction with the school life. the scores for the subjective fatigue symptoms were higher in the male, in the low graders, in the better friend's relation, and in the satisfactory group than the respective counterparts. 3. Concerning home life characteristics, the higher scores of stress were associated with the students characterized by the recognized poor economic conditions, lower interests of parents, lack of satisfaction with the home life, the poor subjective health status. On the other hand, the scores for the subjective fatigue symptoms were higher in the student groups with good economic conditions, higher interests of parents, presence of satisfaction with the home life, and good subjective health status. 4. Concerning daily life style, the higher scores of stress were in the students who had inappropriate sleep hours, skipped breakfasts, daily consumption of intermeal snacks, lack of exercise, daily smoking, normal indices of obesity, and lower indices of health habit. conversely, the scores of subjective fatigue symptoms were higher in the groups who had daily breakfasts, no intermeal snacks, daily exercise, no smoking than their counterparts. 5. The factors exerting influence upon the stress included the satisfaction with life, friend's relation, satisfaction with the home life, exercise, school grades, interests of parents, school year, sex, scores of health habit, degree of obesity, economic conditions of home. Those influencing on the degree os stress included stress, intermeal snacks, smoking, friend's relation and satisfaction with the home life.

도시지역 일부 고등학생들의 우울과 불안에 관한 조사 연구

곽은주,송인순,정용준,조영채 韓國保健敎育.健康增進學會 2003 보건교육건강증진학회지 Vol.20 No.2

This study has examined the degree of depression and anxiety among high school students in an urban area and then explored the factors influencing their depression and/or anxiety status. Self-administered questionnaires were offered to 2,381 students from ten high schools in Daejon Metropolitan City. The items for investigation included such factors as various characteristics of school and family life, daily life style, and the degree of depression and anxiety. Based on the study results, the following conclusions were made; 1. The distribution according to the depression degree has shown that 61.9% of students were normal, 32.9% of students had mild depression, 5.0% moderate depression, and 0.3% severe depression. As for anxiety, 40.2% of students were normal, while 19.1% were classified as having anxiety and 40.7% borderline anxiety. 2. As regards to the degree of depression and anxiety, it was greater in girls than boys, in 3rd graders than 1st and 2nd graders, and in the groups who have recieved lower grades in studies, who had poor relations with their friends and a low feeling of satisfaction with school life. In particular, concerning various characteristics of family life, the scores of depression and anxiety were higher in the groups whose financial conditions were poor, whose parents' interests were lower, whose degree of satisfaction with their family and school life was lower, than their counterparts. 3. According to their life styles higher scores of depression and anxiety were found in the groups whose sleeping time was inappropriate, whose breakfasts were skipped, who ate daily snacks, who didn't take regular exercises, and who had poor health habits, compared to their counterparts, respectively. 4. As for the correlation between the degree of depression and its associated variables, the higher scores of depression were in positive correlation with the groups who had lower grades in studies, poor relation with their friends, low feeling of satisfaction with school and home life, low parents' interest, poor subjective condition of health, breakfast skipping, lack of regular exercises, and lower indices of health habits. 5. As for anxiety, the higher scores of anxiety were in the positive correlation with the groups with poor relation with their friends, low feeling of satisfaction with school and family life, poor subjective condition of health, lack of regular exercises, and poor health habits. 6. The influential factors on the depression of students were selected such as subjective condition of health, sex, feeling of satisfaction with family and school life, grades in studies, relation with their friends, presence of regular exercises, degree of interest of parents, sleeping time, cigarette smoking and eating breakfast. 7. The influential factors on the anxiety state of students were selected such as subjective condition of health, feeling of satisfaction with family and school life, sex, sleeping time, regular exercises, cigarette smoking, snacking and relations with their friends. The present study results suggest that girls rather than boys, higher graders than lower ones are more vulnerable to anxiety and depression state, and besides, various characteristics of school and family life, and daily life style can be influential on students' emotional states. Therefore, better management of psychological status of students is thought to require a wide variety of measures to modify the influencing factors and to encourage social support.