압출성형에 의한 국산 무연탄 활성탄의 세공구조 변화

이송우,문장천,김도한,이창한,최동훈,류동춘,송승구 부산대학교 환경문제연구소 2000 環境硏究報 Vol.18 No.-

The purpose of this study is to investigate the variation of pore size distribution of the coal-based extruded activated carbon. The extruded activated carbon was prepared by extruding the mixture of coal powder and coal tar. Pore size distribution of the extruded activated carbon was compared with that of the extruded coal and the extruded char. Also it was compared with that of the crushed activated carbon, raw coal and char. The extruded coal had coarser surface than that of raw coal. Macropores of the extruded coal were funned near 10,000Å in diameter during carbonization process and steam penetrated easily between particles and were growing between 3,000Å and 20,000Å in diameter during activation process.

분지각이 작고 일시 개화성이 우수한 숙근 안개초 ‘드림송’ 육성

정동춘(Dong-Chun Cheong),최창학(Chang-Hak Choi),송영주(Young-Ju Song),김정만(Jeong-Man Kim),이진재(Jin-Je Lee) 한국원예학회 2014 원예과학기술지 Vol.32 No.4

‘Dream Song’ is a cultivar of Gypsophila paniculata developed by the Jeollabuk-do Agricultural Research & Extension Services in 2010 for cut-flower production. This hybrid was bred from 121 seedlings collected from an open-pollinated population of ‘Gyp06-11’. It has novel morphological characteristics of upright plant type, lanceolate leaves, double florets with a few bright white-colored petals of obovate shape, truncate petal tips, and cup-shaped calyces. Furthermore ‘Dream Song’ has desirable cultivation characteristics including narrow branching angle, and moderate resistance to powdery mildew, thrips and leaf miners. Moreover it produces more primary branches, and longer internodes and flower stalks than reference cultivar ‘Bristol Fairy’ during summer cultivation in a subalpine area (500 m over the sea level). Flowering in ‘Dream Song’ is delayed by about 17 days as compared to ‘Bristol Fairy’. ‘Dream Song’ produces normal flowers with 2 pistils and an average of 10.4 stamens, with fewer malformed flowers than ‘Bristol Fairy’.

농촌지역 노인들의 우울증상에 관련된 요인들의 특성

송미숙,전기홍,송현종,김정은,박승구,신상건,이동훈,정성현,최연주,최완철,최민규,황재철,홍지만 아주대학교 1997 아주의학 Vol.2 No.2

This study was performed to identify risk factors for depression among the elderly in a rural area. A survey was done for the elderly living in Gosam-myenn, Ansung-kun during the period of July 28, 1997 and July 30, 1997. Demographic and sodoeconornic characteristics, and functional and health Status were assessed using a structured questionnaire, and the level of depression was measured by GDS score. The data obtained were analyzed by frequencies, percentage, t-test, ANOVA, and multiple regression, and the results were as follows: 1. The total sample consisted of 133 elderly. Of them, 47 elderly (35.4%) showed significant depressive Symptoms. 2. The GDS score was the highest for the group over 85 years of age (p < 0.05). Those living alone or widowed showed lower GDS score than those living with someone or married (p < 0.05). 3. The GDS score was the highest in the absolutely dependent group, followed by the partially dependent group, and the independent group (p < 0.01). The elderly who perceived their health Status as excellent showed the lowest GDS score. In contrast, those who had more than five chronic diseases showed the highest GDS score. 4. The elderly receiving financial and emotional support from their family or friends showed lower GDS score compared to those without any support. 5. The economically dependent group showed higher GDS score than that of independent group. 6. The elderly who involved in leisure activities showed lower GDS score than those without any involvement. 7. In terms of risk factors for depression, we found that perceived health Status, subjective economic Status, leisure activities, living arrangement and financial support were inversely associated with GDS score, whereas labor support was positively associated with GDS score. Based upon the above findings, this study suggests that these risk factors for depression in the elderly should be taken into consideration for a comprehensive mental health program for the elderly living in the rural area.

내측두엽간질과 신피질 간질에서 간질 발작이 해마에 미치는 영향 : 자기공명분광 연구 MR Spectroscopy Study

김동욱,이상건,정천기,송인찬,장기현 대한간질학회 2004 대한간질학회지 Vol.8 No.1

열처리에 따른 Zircaloy-4 Tube의 부식특성에 관한 연구

이동복,최송천 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.1

열처리에 따른 Zircaloy-4 tube의 부식 특성을 조사하기 위하여 pilger된 시편, 수냉된 시편, 열처리된 시편에 대해, 500℃, 102 기압의 증기하에서의 부식 시험을 실시하였다. 주어진 시험조건하에서 수냉된 시편과 pilger된 시편은 좋은 nodular 부식 저항을 보였으나, 열처리된 시편은 나쁜 nodular 부식 저항을 가졌다. To investigate the effect of heat treatment on the corrosion behavior of water-quenched, heat -treated, and as-pilgered Zircaloy-4 tubes, corrosion testing was conducted at 500℃ in 102 atm of steam atmosphere. Under these given conditions, water-quenched and as-pilgered and the grains become bigger and equiaxed. Heat treated specimens exhibited improved resistance to nodular corroson, while heat- treated specimens had poor nodular corrosion resistance.

청소년에서 폭력에의 노출과 관련된 정신의학적 증상

김동기,이호분,민성길,송동호,육기환,전여숙 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.2

서울 시내 중학생 1345명을 대상으로 폭력에 노출되는 정도와 이와 연관된 정신의학적 증상을 알아보고자 하였다. 이를 위해 자기보고식 설문지를 사용하였는데. 설문지의 내용은 사회인구학적 자료와 집. 학교, 동네에서 폭력을 당하거나 목격했는지를 묻는 문항과 폭력에 의한 정신의학적 증상의 정도를 묻는 TSC(trauma symptom checklist)로 구성되었으며, 그 결과는 다음과 같다. 1) 전체 학생 중 45%가 폭력에 노출된 경험이 있었으며. 남자가 여자보다 많았다 (p<0.025). 집에서 구타 당한 경험은 여학생이 22.8%로 남학생보다 유의하게 높았다 (p<0.001). 학교. 동네에서 구타당한 경험은 남학생이 각각 22.1%. 10.1%로서 여학생보다 유의하게 높았다. 2) TSC를 요인 분석한 결과 불안-우울, PTSD, 해리, 분노 증상으로 나뉘었다. TSC는 폭력 경험 변인들과 상관 관계를 나타냈다. 다중 회귀분석을 실시한 결과 TSC와 연관된 폭력 노출 변인은 일생 동안의 폭력 노출(R²=0.18). 최근의 성폭력 경험(R²=7.12). 최근 집에서의 폭력 경험(R²=0.08), 최근 학교에서의 폭력 경험(R²=0.08), 최근 집에서의 폭력 목격(R²=0.07). 모든 종류의 폭력 노출(R²=0.29)로 나타났다. 3) TSC와 유의하게 연관된 사회인구학적 변인은 여성, 물질 남용의 가족력이 있는 경우, 술이나 담배 약물 남용을 하는 청소년인 것으로 나타났다. 따라서 청소년 폭력에의 희생자에 대한 정신의학적 개입에는 이러한 위험인자에 대한 고려가 필요하리라고 본다. In this research, we examined the frequency of exposure to violence in the home, school and neighborhood among middle school students as well as its related psychiatric symptoms. A total of 1,345 students from 5 middle schools in Seoul participated in this study : 670 were male,675 were female. We administered self-reported questionaires including discriptions of exposure to violence and a trauma symptom checklist(TSC)(Singer 1995). 1) The total frequency of exposure to any type of violence was 45% in our sample. The frequency of girls' being hit in home was 22.8%, which was significantly higher than it was for boys(p<0.001). The frequency of boys' exposure to violence in school and in the neighbor-hood was 22.1% and 10.1% respectively, which was higher than it was for girls(p <0.005). 2) In factor analysis of TSC, 4 factors were identified. TSC including depression-anxity, PTSD, dissociation and anger was correlated with violence exposure variables. Multiple regression analysis revealed that TSC is related with violence victimization in life(R2=0.18), sexual assault(R2= 0.12), recent victimization in the home(R2= 0.08), recent witness to violencein the home(R2=0.07), recent victimization in school(R2=0.08) and all violence exposures(R2=0.29). 3) Among the demographic variables, sex, parental alcohol problem and student alcohol-smoking-drug problems influenced the TSC(p <0.005). TSC could be result of witness to violence as well as violence victimization. And the risk factors for violence-related psychiatric symptoms were mainly seen in females, who have parents with alcohol problems or who themselves have alcohol-smoking-substance problems. So intervention programs for violence victims should be focused on the these high risk group.

수증기 활성화법으로 제조된 활성탄의 탄화온도에 따른 세공구조 고찰

이송우,나영수,김도한,최동훈,류동춘,송승군 한국환경과학회 2000 한국환경과학회지 Vol.9 No.4

Activated carbons were prepared from Korean coal by steam activation in this study. The variation of pore structure of the activated carbons were investigated according to different carbonization temperatures. Yield, surface area, pore volume and pore structure of this activated carbon were compared with those of activated carbon prepared without carbonization. The investigated carbonization temperature ranged from 700℃ to 1,000℃. Carbonization was carried out in nitrogen atmosphere for 70 minutes and activation was performed by steam at 950℃ for 210 minutes. Surface area and pore volume of the resulting activated carbons increased with carbonization temperature. Also pore volume increased by 20% compared to the activated carbon without carbonization. Especially, in mesopore region, the activated carbon carbonized at 900℃ had more pores by 60% than that of activated carbon carbonized at other temperature.

cis-Dichlorodiammineplatinum(Ⅱ)이 발정주기에 따른 흰쥐 난관섬모 세포의 형태 및 섬모형성에 미치는 영향에 관한 전자현미경적 및 면역조직화학적 연구

김동옥,송양주,전영희,정호삼 한양대학교 의과대학 1995 한양의대 학술지 Vol.15 No.1

electron microscope for morphological changes of cytoplasmic organelles and with light microscope for detection of tubulin substances in the cytoplasm during estrous cycle. Experimental animals(weighting 200gm. female albino rats) divided into 4 groups by the estrous cycles. Ampullar oviducts of these animals were excised at each estrous cycles. The specimen was made into immunocytological reaction slides for detection of tubulin in the cytoplasm, and the other specimen were made to ultrathin section for electron microscopy. All of specimens were examined with light and electron microscope. The results obtained are as follows. 1. The tubulin substances in ciliated cells of oviducts revealed strong reactions during proestrus and estrus but weak reactions during metestus and diestrus. 2. After cis-Platin treatment, tubulin substances in the cytoplasm of oviductal ciliated cells showed weak stain reactions but at diestrus, moderate reactions were seen similar to that of the control group. 3. The cilia and basal bodies of ciliated cells of ampulla oviducts after cisplatin treatment were decreased in number at all stages of estrous cycle. 4. Ciliated cells in cis-Platin treated rat revealed hypertropies of mitochondria, atrophies of Golgi complex, decrease of polyribosomes and segmented cisternae of rough endoplasmic reticulum at proestrus, estrus and metestrus. It is consequently suggested that cis-Platin would induce inhibition of ciliogenesis in oviductal ciliated cells during estrous cycles.

Ni_3Al 金屬間 化合物의 高溫酸化時 酸化膜의 剝離에 關한 硏究

崔松天,李東馥 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.1

The high temperature oxidation behavior of the intermetallic compound of pure Ni_3Al was studied above 1000℃. In isothermal oxidation tests between 1000-1200℃, Ni_3Al showed parabolic oxidation behavior and displayed excellent oxidation resistance. In cyclic oxidation test, Ni_3Al exhibited excellent oxidation resistance but the drastic spalling of oxide scales was observed at 1300℃. Al_2O_3 was present as θ-Al_2O_3 in a whisker form at 1000℃, but, as the temperature increases, thermodynamically metastable θ-Al_2O_3 was transformed to stable α-Al_2O_3. At 1200℃, α-Al_2O_3 having an equiaxed structure in the outermost scale and columnar structure inside was present. Scale spalling it Ni_3Al was attributed to the kirkendall voids formed at the metal/oxide interface, which act as the source of stress concentration.

농약살포자 혈중 콜린에스테라제 활성도의 변화 및 농약성분

신동천,이순영,정상혁,원종욱,박종세,박송자 大韓産業醫學會 1994 대한직업환경의학회지 Vol.6 No.2

In order to ascertain the status of health damage among Korean farmers who spray pesticides regularly in summer, blood and urine samples were collected for 88 volunteers during July to September in 1990. Serum cholinesterase activity, parent compounds of pesticides in blood and urine, SGOT, SGPT, blood pressure, pulse rate were measured. The results were as follows; 1. Mean cholinesterase activity after spraying pesticides was significantly lower than that before spraying. While proportion of abnormal cholinesterase activity(<1990 U/L) group was 2.3% before spraying pesticides, the proportion of the group after spraying was 22.8%. 2. Cholinesterase activity were decreased over 50% in 14.7% of the subjects who can be classified into poisoning group 3. While pulse rate and blood pressure were slightly increased in poisoning group, those were significantly decreased in non-poisoning group. 4. Consecutive spraying of pesticide caused further reduction of cholinesterase activity. 5. Five parent compounds of pesticides frequently used during summer farming were analyzed using 106 blood samples. IBP in one sample and Isoprothiolane in four samples were detected. No parent compounds were detected in urine samples.