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심재구 ( Jae-goo Shim ),아프잘아킬 ( Afzal Aqeel ),최보미 ( Bo-mi Choi ),이정현 ( Jung-hyun Lee ),곽노상 ( No-sang Kwak ),임호진 ( Ho-jin Lim ) 한국물환경학회(구 한국수질보전학회) 2016 한국물환경학회지 Vol.32 No.4
N-nitrosamines are a class of carcinogenic chemicals that can pose significant hazards to the human life. Ultraviolet (UV) light irradiation is considered as one of the effective methods to reduce N-nitrosamines in the aqueous phase. This study aimed to investigate the pH influence on UV photodegradation of N-nitrosamines (i.e., N-nitrosodibutylamine (NDBA) and N-nitrosopyrrolidine (NPYR)) closely related to water treatment. Photodegradation rate constants of NDBA and NPYR remained between 3.26×10-2 L/W-min to 5.08×10-3 L/W-min and 1.14×10-2 L/W-min to 2.80×10-3 L/W-min at pH2-10, respectively. This study also focused on the formation of oxidized products (i.e., primarily NO2- and NO3-). Under slightly acidic and eutral conditions, NO2- formation was more prevalent than NO3- formation, while under strong acidic conditions, NO3- was more prevalent. There was no significant change in total organic carbon (TOC) and total nitrogen (TN), suggesting negligible loss of N-nitrosamines and degradation products from the system. NDBA was easily photodegraded than NPYR. This study also demonstrated that a lower pH is a favorable condition for photolytic degradation of N-nitrosamines in water.
Noémi Seres,László Dunai 국제구조공학회 2011 Steel and Composite Structures, An International J Vol.11 No.1
The subject of the ongoing research work is to analyze the composite action of the structural elements of composite slabs with profiled steel decking by experimental and numerical studies. The mechanical and frictional interlocks result in a complex behaviour and failure under horizontal shear action. This is why the design characteristics can be determined only by standardized experiments. The aim of the current research is to develop a computational method which can predict the behaviour of embossed mechanical bond under shear actions, in order to derive the design characteristics of composite slabs with profiled steel decking. In the first phase of the research a novel experimental analysis is completed on an individual concrete encased embossment of steel strip under shear action. The experimental behaviour modes and failure mechanisms are determined. In parallel with the tests a finite element model is developed to follow the ultimate behaviour of this type of embossment, assuming that the phenomenon is governed by the failure of the steel part. The model is verified and applied to analyse the effect of embossment’s parameters on the behaviour. In the extended investigation different friction coefficients, plate thicknesses, heights and the size effects are studied. On the basis of the results the tendencies of the ultimate behaviour and resistance by the studied embossment’s characteristics are concluded.
축구선수의 Detraining과 Retraining이 혈청지질 및 호르몬농도에 미치는 영향
정정화,박재현,채종훈,성혜련,황지인,윤미숙,노금선,윤종관,윤영학,노순덕,정경숙,박일규,김은희,박현태,박상갑 대한스포츠의학회 1999 대한스포츠의학회지 Vol.17 No.1
The purpose of this study was to investigate the effects of detraining and retraining on serum lipid and hormones in soccer players. Subjects were seven male high-school soccer players. V˙O_2max was determined for each subjects by administering a treadmill test(initial speed: 90m/min, grade: 5%, increasing speed per 3 min: 30m/min). Serum lipid(T-C, TG, HDL-C LDL-C) and hormones(epinephrine, norepinephrine, growth hormones, cortisol) were assayed pre and post detraining in 10, 20, 30 days after retraining. The repeated ANOVA was used to determine significant differences. The 0.05 level of significance was as critical level for the study. The results of the study were as follows: 1. V˙O_2max(ml/min) were 3576.3±204.2ml/min pre detraining, 3234.1±198.9 ml/min post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/min) were 3601.4±170.9 ml/min. There were significantly(p<.05) increased in retraining periods. 2. V˙O_2max(ml/kg/min) were significantly(p<.05) decreased from 62.3±2.9 ml/kg/min to 55.9±4.7 ml/kg/min in detraining. In 10, 20, 30 days after retraining, V˙O_2max(ml/kg/min) were 62.4±3.4ml/kg/min, 62.7±2.3ml.kg/min, 67.3±7.2ml/kg/min respectively. There were significantly(p<.05) increased in retraining periods. 3. T-C were significantly (p<.05) increased from 166.6±8.5mg/dl to 175.3±10.3 mg/dl in detraining. In 10, 20, 30 days after retraining, T-C were 160.1± 3.2mg/dl, 156.7±3.7mg/dl, 140.3±9.0mg/dl. There were significantly(p<.05) decreased in retraining periods. 4. HDL-C were 61.4±6.6mg/di pre detraining, 5.3±6.6mg/dl post detraining. There are significant(p<.05) difference between pre and post detraining. In 10, 20, 30 days after retraining, HDL-C were 56.9±7.1mg/dl, 56.4±9.2mg/dl, 57.7±9.1mg/dl respectively. There were no significant difference in retraining periods. 5. The hormones(epinephrine. norepinephrine, growth hormone, cortisol) were changed as same patterns. Epinephrine were 26.0±7.0[g/ml pre detraining, 24.6±3.2pg/ml post detraining. In 10, 20, 30 days after retraining, epinephrine were 26.9±5.6pg/ml, 30.6±6.2pg/ml, 29.4±5.6pg/ml respectively. There were no significant difference in retraining periods. In conclusion, HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were decreased, T-C, LDL-C and TG were increased in detraining. But HDL-C, epinephrine, norepinephrine, growth hormone and cortisol were increased, T-C, LDL-C and TG were decreased in retraining.
노치권(외 6명) 신라대학교 자연과학연구소 2012 自然科學論文集 Vol.22 No.-
To study fauna of Silla University located in Mt. Baek-yang, we conducted six surveys from 29 May 2011 to 28 April 2012. We found five phyla 41 orders 197 species of animals inhabiting in this area: four phyla 27 orders 163 species of invertebrates and in vertebrates one order six species of fishes, three orders nine species of amphibians and reptiles, six orders 14 species of aves, and four orders five species of mammals. Of these species, some Korean endemic species were included: a fish of Rhodeus uyekii in a pond near main gate of this university, a frog of Rana coreana in a creek near a dormitory, and a rabbit of Lepus coreanus and a water deer of Hydropotes inermis in a grass region near a main stadium. A kind of hawk, Falco tinnunculus as a natural monument (animal) of no. 323-8, was observed on a building of medical and life science. A blue frog of Hyla japonica as a variation was found near a spring resort. Therefore, this area is considered an ecologically important area having a high animal diversity.
고등학교 학생들의 작용 : 반작용 관련 오개념 교정에 관한 연구 reaction of senior high school students
노미라,김대식 충북대학교 과학교육연구소 2002 과학교육연구논총 Vol.18 No.1
The purpose of this study is to analyze the students' conceptions about force and motion of senior high school students after study the course of Physics and to investigate how students' misconceptions about action - reaction are changed through individual interview with students. To do this, for 1st questionnaire, 100 students were selected from the 3rd year students in senior high school in Choong-ju city and tested. For 2nd questionnaire, 10 students with misconceptions about action - reaction of them were selected and tested again. As the results of this study, nine of ten students were changed their misconception about action - reaction after individual interview. In the base of this study, the concept of 'Force and Motion' in Natural Science of the junior high school course are associated with those in Integrated Science and Physics of the senior high school course, but many students in the senior high school don't understand the correct scientific concept. Most of students will be moved up to the next school year with many wrong concepts.
김현수,노호성,竹田正樹,이미숙,田中喜代次 대한스포츠의학회 1994 대한스포츠의학회지 Vol.12 No.2
To validify the physiologic availability of the playport game, we examined the metabolic and ventilatory responses of second and fourth grade boys(n=6) and adult men(n=4) during playport games. In children, maximal oxygen uptake(V˙O_2max) and lactate threshold(V˙O_2 LT) measured on treadmill, averaged 47.3±3.4 ml·㎏^1·min^1 and 27.6±1.9 ml·㎏^1·min^1, respectively. The playing at the 8 min playport elicited an average of 44.1±5.2 ml·㎏^1·min^1 during the last 4 min after starting the play, which corresponded to approximately 90% of V˙O_2max. When compares the lactate (La) levels between children and adults, the children has significantly lowered La at 2.44±0.6 mM/ l and below than the adult groups. The present results suggested that children experience high intensity physical activity during playport game seemingly contributed to the enhancement of cardiorespiratory function.