이온교환법에 의한 탈질소 공정개발의 기초연구 (Ⅲ) : 희분식 반응기에서의 반응속도론 A kinetic study in the batch reactor

채용곤,이동환,김승일,윤태경,홍성수,이민규 한국환경과학회 2000 한국환경과학회지 Vol.9 No.2

A kinetic study for anion exchange was performed for commercially available Cl^- type anion exchange resin in use to remove nitrate in water. The obtained results from the batch reactor were applied to the Langmuir and Freundlich models. The constants for Langmuir model were q_max=29.82 and b=0.202, and for Freundlich model were K=5.509 and n=1.772. Langmuir model showed better fit than Frendlich model for the experimental results. Ion exchange reaction rate was also calculated and the approximate first-order reaction, rate constant k_1 was 0.16 L/㎎·hr. Effective diffusion coefficient was obtained in the range from 9.67×10 exp (-8) to 1.67×10 exp (-6) ㎠/sec for initial concentration change, and from 6.09×10 exp (-7) to 3.98×10 exp (-6) ㎠/sec for reaction temperature change. Activation energy during the diffusion was calculated as 36 ㎉/㏖.

유도 결합형 플라즈마에서 In-situ 플라즈마 전자밀도 측정방법 연구

정민중,김곤호 한양대학교 이학기술연구소 2002 이학기술연구지 Vol.5 No.-

유도 결합성 플라즈마 발생 장치에서 플라즈마 밀도를 측정하기 위한 In-Situ 플라즈마 진단 방법을 개발하였다. 안테나로 인가된 전력은 모두 플라즈마를 발생시키는데 소모되었다고 가정하여, 전력 균형식으로부터 안테나에 인가된 전력과 플라즈마 내부인자의 함수관계를 유도하고, 안테나 안가 전력의 전류와 전압을 측정하여 전자밀도를 유추할 수 있다. 안테나의 전류와 전압을 실시간으로 측정하는 전력측정 장치를 제작하고, 아르곤 가스를 이용하여 50, 40 및 30 mtorr의 운전 압력에서 인가 전력을 300- 800W로 바꾸어 가면서 실험하였다. 정전 탐침을 이용해서 반옹기 내부에서 직접 얻은 플라즈마 밀도와 안테나에 인가된 전력을 이용하여 측정된 전자밀도의 비율은 인가 전력에 무관하게 일정한 값을 보였으나, 운전 압력에 따라서 0.1 , 0.3 그리고 0.5의 값을 가졌다. 개발된 진단 방법이 운전 압력에 민감하나 플라즈마 밀도 변화를 정성적으로 관측할 수 있는 방법임을 보였다. In-situ plasma density monitoring system in an inductively coupled plasma source has been developed. Assuming the input power delivered only to the plasma generation, the relation between the delivery Power on the antenna and the plasma parameters can be obtained from the power balance equation. The in-situ system to monitor the current and voltage of the antenna was manufactured. Experiments were carried out under Ar gas pressures, 50, 40, and 30 mTorr with varying the rf power from 300 to 500w, respectively. Plasma parameters were measured directly by the electrical probe and compared to the results taken from the power monitoring system. The comparison shows that the power monitoring system was not sensitive to the input power but to the operating pressure. The system can beused monitor the qualitative behaviour of the plasma in the chamber .

고등학생의 체육수업 참여동기가 내적동기에 미치는 영향

강민곤;박문환 순천향대학교 기초과학연구소 2010 순천향자연과학연구 논문집 Vol.16 No.2

This study focuses on analyzing relationship between motive of high school P.E. and the students’ intrinsic motivation providing basic information in order to induce their voluntary participation through physical activity First, participatory motivations were different according to sex, grade year, and athletic club activities; Male students showed more participation than females, and the first-year students were the most-highly motivated ones, followed by third- and second-year students. Also, the students who were enrolled in athletic clubs had better participatory motivation than those who were not. Second, intrinsic motivations were also different according to sex, grade year and athletic club activities; male students were motivated more intrinsically than females, and the first-year students showed highest intrinsic motivation, followed by third- and second-year students. Also, the students who were enrolled I athletic clubs had higher intrinsic motivation than those who were not. Third, for the influence of the motivation of participation to intrinsic motivation, higher nothing-motivation (B=-.116, p<.05) seemed to result lower intrinsic motivation, and higher interests (B=.356, p<.001) appeared to bring higher intrinsic motivation.

고등학생의 체육수업 참여동기가 체육수업 만족도에 미치는 영향

강민곤;박문환 순천향대학교 기초과학연구소 2010 순천향자연과학연구 논문집 Vol.16 No.2

This study focuses on analyzing relationship between motive of high school P.E. and the students’ Satisfaction providing basic information in order to induce their voluntary participation through physical activity. First, participatory motivations were different according to sex, grade year, and athletic club activities; Male students showed more participation than females, and the first-year students were the most-highly motivated ones, followed by third- and second-year students. Also, the students who were enrolled in athletic clubs had better participatory motivation than those who were not. Second, in satisfaction criteria, male students were satisfied more than females. The level of satisfaction according to school year did not show significant differences, showing p>0.05. The students who were participating in athletic clubs appeared to have higher level of satisfaction than those who were not. Third and the last, the conclusion of the effect of the motivation of participation toward satisfaction is like below: it appeared that refreshing (B=.210, p<.01), one of the factors of the motivation of participation, and satisfaction have positive co-relationship. Interest (B=.215, p<.001), another factor of the participatory motivation, appeared to affect positively on satisfaction - which shows positive co-relation. Sociality (B=.208, p<.001) also affected positively on satisfaction, so that one can safely say the higher the sociality, the higher the satisfaction.

알루미나 첨가가 불규칙 입자형상을 갖는 세리아 안정화 지르코니아의 미세구조에 미치는 영향

김민정,이종국,박종곤 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.2

The effect of Al₂O₃ addition on the microstructure of ceria-stabilized zirconia with irregular grain shape was investigated. Specimens doped with a mixed solution of Al₂O₃+ Ce(NO³)₃ showed undulated grain shape after annealing at 1650℃ for 2h. The specimens added Al₂O₃ inhibited grain growth of Ce-TZP and simultaneously increased the irregularity of the grain shape due to drag effect. Ceria concentration difference between convex and concave sides in irregular grains was observed over 1mol%.

乳房炎 乳汁에서 分離된 原因菌의 抗菌劑 感受性

崔民淳,金鍾冕,趙正坤,蔡孝錫,姜明大,宋熹鍾 全北大學校 附設 畜産開發硏究所 1987 畜産開發硏究報告 Vol.1 No.-

A total of 189 strains (Streptococcus agalactiae and non-Streptococcus agalactiae 110, Staphylococcus aureus 63, and E. coli 16) isolated from bovine mastitie milk samples by "The Connecticut Mastitis Control Program" in dairy herds were examined for drug susceptibility to 8 drugs and analysed the rate of multiple resistant patterns. 1. All of the isolates were resistant to antimicrobial agents such as penicillin (PC), streptomycin (SM), kanamycin(KM), carbenicillin (CA), lincomycin (LM), gentamicin (GM), and tetracycline (TC), singly or multiply. The isolates were more susceptible to CA (84.1%),PC (78.9%), and SM (78.4%) than the the other drugs such as GM (51.8%), KM (48.7%), TC (19.6%) and LM (19.0%) in order. 2. The multiple resistant isolates (96.3%) were more than those of singly resistant isolates (3.7%) and 58 different drug resistant patterns were observed. Among 7 singly resistant isolates, CP was the commonest. While among 182 multiple resistant isolates, CP-KM-LM-TC-GM, CP-LM-TC, CP-LM-TC-GM, PC-CP-SM-LM-TC-GM, CP-KM-LM-TC, and CP-LM patterns were frequently encounted. 3. The strains of streptococcus spp. were more susceptible to CA (90.1%) and SM (82.9%) than the other drugs such as KM (43.2%), GM (38.7%), LM (13.5%), CP (10.8%) and TC (10.8%). Among them CP-KM-LM-TC-CM pattern was frequently encounted. 4. The strains of Sta. aureus were more susceptible to PC (74.6%),CA (69.8%), SM (65.1%) and GM (63.5%) than the other drugs such as KM (46.0%), CP (22.2%), TC (15.9%) and LM (9.5%). Among them CP-LM-TC pattern was commonly encounted. 5. The strains of E. coli were more susceptible to CA (100%) and KM (75.0%) tnan TC (9.5%). But the other drugs such as PC, SM, GM, CP and LM were not. Among them PC-CP-SM-LM-TC-GM pattern was commonly encounted.

다양한 비스테로이드성 소염진통제의 쥐 피부 투과

김민정,도희정,조원제,용철순,최한곤,이치호,김대덕 한국약제학회 2002 Journal of Pharmaceutical Investigation Vol.32 No.4

Rat skin permeation of various nonsteroidal antiinflammatory drugs (NSAIDs) was investigated in vitro using Franz diffusion cell at 37℃. The effect of various skin permeation enhancers was also observed as a preliminary study of developing transdermal delivery systems of NSAIDs. Lipophilicity of NSAIDs was determined from the partition coefficient (log P) in 1-octanol/water and 1-octanol/IPB mutual-saturated solutions. The solubility was determined in water, isotonic phosphate buffer (IPB), and propylene glycol (PG) at 37℃. The rat skin permeation rate of acetaminophen, piroxicam, and aceclofenac was almost negligible, although they were saturated in PG. Addition of 1 % permeation enhancer increased the permeation rate of ketoprofen, ketorolac, and diclofenac. However, the skin permeation rate of ibuprofen did not increase with the addition of various enhancers. Among the permeation enhancers tested, oleic acid was the most effective for various NSAIDs. Based on the daily dose, lipophilicity, and the skin permeation rate achieved in this study, ketoprofen and ketorolac seem to be the most promising drug candidates for transdermal delivery systems, especially when formulated with unsaturated fatty acids, such as oleic acid.

전북지방 젖소의 유방염 검색

조정곤,김종면,최민순,채효석,강명대,송희종 全北大學校 附設 畜産開發硏究所 1987 畜産開發硏究報告 Vol.1 No.-

A total of 444 quarters milk samples of 111 dairy cattle in Chonbuk area were examined for infection rete and causative agents of mastitis by "the laboratory procedures used in the Connecticut Mastitis Control Program (CMCP) and California mastitis Test (CMT)". The results obtained were as follows: 1. Of 444 samples, 39.2% had positive CMCP value and 24.4% positive CMT reaction. 2. One hendred and seventy four (39.2%) from 82 cattle (73.9%) were found to infected with mastitis. It was found that 8(1.8%0 of the infected quarters were clinical mastitis and all of the rest were subclinical mastitis. 3. The main causative agents were found to Staphylococcus aureus (63 quarters), Streptococcus agalactiae (56 quarters), non-Str. agalactiae streptococci (54 querters), Escherichia coli (19 quaters), the actual total number of quarters detected as mastitis would be 174, as 18 of these quarters showed multiple infection with two different organisms. 4. Having examined the number of infection quarter per head of mastitis in dairy cattle sampling, major finding were that the average number of infection quarters to total dairy cattle exemined was 1.57 quarters, and that of the infected cattle was 2.1 quarters. Infected quarters in cattle with 1, 2, 3 and 4 were noted 27(32.9%), 28(34.1%), 17(20.7%), and 10(12.3%), respectively.

신규 3작용성 메타크릴레이트의 치과용 광중합형 콤포짓트 레진용 단량체로서의 응용 연구

김중곤,정찬문,김민성,김광만,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

Tris[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]methane(THMPM) was prepared easily from triphenylolmethane triglycidyl ether in good yield. As compared with composite resin formulated with difunctional bis-GMA, the physical properties of a newly developed composite resin formulated with trifunctional THMPM was evaluated. Cytotoxicity and acute toxicity of composite resin based on trifunctional THMPM evaluated according to ISO standard method. The depth of cure of the composite resin based THMPM was higher than that of the bis-GMA composite. There were no significant differences in flexural strength and water sorption between the composites resin based on THMPM and bis-GMA. The water-solubility value for the light-activated composite resins formulated with THMPM was much lower than that for a control bis-GMA composite. According to cytotoxicity evaluation, the composite resin based on THMPM showed very mild cytotoxicity with the response index of between 0/0 and 1/0. No acute toxicity of composite resin formulated with trifunctional THMPM was also observed. It is believed that THMPM is promising candidate for application as a photocurable dental composite resin.

주산기 백서에서 혈중 에스트로겐 농도와 공간 기억력과의 상관관계

박민성,박제민,신성현,한귀원,김명정,김성곤 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.5

Objectives : This study was designed to find possible effect of pregnancy and parturition on spatial memory, especially in relation to levels of estrogen during the third trimester and postpartal period in rats. Methods : 25 female Sprague Dawley rats were divided into pregnant group (N= 14) and control group (N= 11). Changes in spatial memory during 6 weeks including third trimester and postpartal period were measured using Morris water maze. Time to reach the platform in the maze was indicator of spatial memory. Serum estrogen level was measured on 1 week before delivery, postpartal day 1, and day 14. Results : Both groups showed gradual improvement in performance by trial days and weeks, but no significant difference was found between the two groups. However in the third trimester, pregnant group showed a trend of less achievement on 3 days of learning than control group. Serum estrogen levels did not differ significantly between groups over the 6 weeks of period. However there was positive correlation between serum estrogen level on postpartum day 1 and time to reach platform on postpartum week 2, and negative correlation between estrogen level on postpartum day 14 and latency to the platform on postpartum week 5. Conclusion : These results imply that changes in the serum estrogen level may have dual effects on the spatial learning in peripartal period. It is suggested that decline in cognitive function might occur either by failure of rapid decrease of estrogen, immediately after parturition, or retarded restoration of estrogen in later postpartal period.