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하수 2차 처리수 재이용을 위한 저압 및 중압 고도산화시스템의 성능평가
안규홍,안석,맹승규,김기팔,홍준석,정민우,권지향,Ahmed, Zubair 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4
In the present study, the feasibility of UV/H₂O₂ systems was investigated using low and medium-pres sure lamps on biologically treated wastewater effluents for secondary effluent reclamation. Two types of UV lamps were used as the light sources (a 33W lowpressure mercury lamp and a 350-W mediumpressure mercury lamp). The results from these UV systems showed that the removal of organic compounds could be achieved in the contact time of longer than 30min (i.e., low UV doses). Efficiencies of color removal and disinfection were far better than those of organic matters measured as TOC, DOC and TCOD_(cr). In the low pressure lamp UV system, it has been found that DOC and color removals were 60.9 and 86.2% with 50㎎/L of H₂O₂ and contact times of 30 minute, respectively. Whereas, with the mediumpressure lamp UV system, TOC, DOC and color removal were 27.1, 5.6 and 95% with 14.3㎎/L of H₂O₂ and 14 minute of contact times, respectively. Both systems could be applied for the reclamation of secondary effluent treated with biological treatment processes.
林熙大,鄭海駿,金八圭,朴承範 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)
Education is the process of acquiring or transferring knowledge from our existing body of tyeory and experience. The educational process must provide the Civil Engineers with ability to comprehend and adapt to the continuing changes in the practice of their profession. During the past several years, many practice-oriented educational programs and researchoriented programs have developed for students, but most of them are related to the improvement of curriculum. This paper deals exclusively with the spot-practice of civil engineering students. As the results of an analysis for the spot-practice, it is realized that the past spot-practice was somewhat isolated from outside environment and found too rigid to meet the changing requirements. The improvement of the spot-practice for civil engineering students is strongly recommended to produce qualified teachers, taking into account the changing social demands.
자외선/과산화수소 고도산화공정에 의한 하수 2차 처리수 중의 용존유기물 분해에 미치는 부유물질과 과산화수소 농도의 영향
안규홍,이석헌,안석,김기팔,정민우,맹승규 대한상하수도학회 2002 상하수도학회지 Vol.16 No.3
Secondary effluent of activated sludge process was treated by UV/H_2O_2 advanced oxidation process to investigate the effect of suspended matter and H_2O_2 concentration. With low dosage of UV radiation, the concentration of the dissolved organic compounds measured as DOC could be increased with and without hydrogen peroxide. It was suggested that the cause of DOC increase in treated samples was the decomposition of suspended microbial particles and the incomplete oxidation of dissolved organic compounds. The removal of suspended solid significantly enhanced the degradation of DOC in both UV and catalyzed UV oxidation. Color and odor of secondary effluent was effectively removed. Turbidity was decreased by oxidation and the particle size distribution was shifted to lower range. With increased H_2O_2 dosage (30∼120mg/l), the removal of DOC was enhanced. To obtain the required quality meeting the regulated level for water reuse, additional treatment for turbidity rejection was required.
강병조,임완빈,김승팔 大韓神經精神醫學會 1986 신경정신의학 Vol.25 No.4
The study was designed to investigate the anxious and depressive trends in the wives of alcoholic patients. For the purpose of assessment of anxiety and depression, Zung's self-rating anxiety-(SAS) and depression scales (SDS) were applied to the fifty wives of alcoholics, the latter were admitted to the psychiatric wards of Taegu Catholic Hosp. and Kyungpook National Univ. Hosp. from Jan 1 '84 to Sep. 30 '85 and were diagnosed according to DSM- criteria. And the two scales were also applied to the fifty wives of social drinkers as a control group. The results were as follows; 1) The mean SAS scores were 53.06±9.66 in the wives of alcoholics and 38.64±8.75 in the control group and so the difference was significant in anxious trends (p<0.01) between two groups. 2) The mean SDS scores were 54.00±10.20 in the wives of alcoholics and 42.64±7.80 in the control group and so the difference was significant in depressive trends (p<0.01) too between two groups. 3) As for the frequency order of the SAS items in the wives of alcoholics, they were apprehension, insomnia, restlessness and fear. As for the frequency order of the SDS items in the wives of alcoholics, they were confusion, decreased libido, decreased appetite and psychomotor retardation. 4) As for the wife's attitude toward her husband, nagging and interfering attitude was commonest(46%) in the wives of alcoholics in contrast to the gentle and tender attitude(48%) in the wives of social drinkers. 5) 62% of wives of alcoholics were dissatisfied with their sexual life but the degree of dissatisfaction was low to 8% in the wives of social drinkers.
Son, Pal Won,Chung, Jae Seung,Kim, Jin Hee,Kim, Sung Han,Chung, Ee-Yung 한국발생생물학회 2014 발생과 생식 Vol.18 No.3
Characteristics of the developmental stages of spermatids during spermiogenesis and phylogenetic classicfication of the species using sperm ultrastructures in male Crassostrea ariakensis were investigated by transmission electron microscope observations. The morphology of the spermatozoon of this species has a primitive type and is similar to those of Ostreidae. Ultrastructures of mature sperms are composed of broad, modified cap-shaped acrosomal vesicle and an axial rod in subacrosomal materials on an oval nucleus, four spherical mitochondria in the sperm midpiece, and satellite fibres which appear near the distal centriole. The axoneme of the sperm tail shows a 9+2 structure. Accordingly, the ultrastructural characteristics of mature sperm of C. ariakensis resemble to those of other investigated ostreids in Ostreidae in the subclass Pteriomorphia. In this study, particularly, two transverse bands (stripes) appear at the anterior region of the acrosomal vesicle of this species, unlike two or three transverse bands (stripes) in C. gigas. It is assumed that differences in this acrosomal substructure are associated with the inability of fertilization between the genus Crassostrea and other genus species in Ostreidae. Therefore, we can use sperm ultrastructures and morphologies in the resolution of taxonomic relationships within the Ostreidae in the subclass Pteriomorphia. These spermatozoa, which contain several ultrastructures such as acrosomal vesicle, an axial rod in the sperm head part and four mitochondria and satellite fibres in the sperm midpiece, belong to the family Ostreidae in the subclass Pteriomorphia.
Xpert MTB/RIF Assay as a Substitute for Smear Microscopy in an Intermediate-Burden Setting
Lee, Hyun-Seung,Kee, Seung-Jung,Shin, Ju-Hyeon,Kwon, Yong-Soo,Chun, Sejong,Lee, Jun Hyung,Won, Eun Jeong,Choi, Hyun-Jung,Kim, Soo Hyun,Shin, Myung-Geun,Shin, Jong-Hee,Suh, Soon-Pal American Thoracic Society 2019 American journal of respiratory and critical care Vol.199 No.6
Seung-Chul Shin,Soo-Kyung Jwa,Sung-Hyun Park,Pal-Hyung Lee,Yeon-Soo Chang 대한예방치과학회 2012 International Journal of Clinical Preventive Denti Vol.8 No.2
Objective: In order to compare the gingival subside effect by use of Neo-B 2 lanes toothbrush, as newly developed toothbrush available for modified Bass technique, to use with Butler 210 toothbrush, in clinical. Methods: 67 volunteers for comparing 3 lanes and 2 lanes toothbrush and 51 volunteers were joined in clinical test, dividing with 2 groups as control using Butler 210 toothbrush and experimental group as using Neo-B toothbrush, for 4 weeks, PHP, PMA, CPI and CPITN were checked at before 1 week, 2 weeks and 4 weeks later and compared the data. Results: The plaque removal effect was a little bit more by use of 3 lanes toothbrush than 2 lanes of Neo-B toothbrush, but there was no significant different statistically (p>0.05). PHP, PMA, CPI and CPITN were decreased at some period of using with Butler 210 2 lanes toothbrush as control group, for 4 weeks, otherwise, there were decreasing tendencies for all items for all terms I experimental group as using with Neo-B toothbrush (p<0.05). To use Neo-B toothbrush was more effective to decrease PMA by using for 4 weeks, than to use Butler 210 toothbrush. Conclusion: It was recommended to use Neo-B 2 lanes toothbrush for early stage of gingivitis dental patient in order to subside it.