SOLUBILITY OF NITROGEN IN CLEAN EIRE EXTINGUISHING AGENTS AT HIGH PRESSURE

Kim,Jae-Duck,Lim,Jong-Sung,Lee,Youn-Woo,Lee,Youn-Yong 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-

Isothermal solubilities of nitrogen in clean fire extinguishing agents, such as bromotrifluoromethane (Halon-1301), bromochlorodifluoromethane (Halon-121 t), 1,1,1,2,3,3,3- heptafluoropropane (HFC-227ea), and trifluoroiodomethane (FIC-13I1) were measured in a circulation-type equilibrium apparatus. The temperature range was (293.2 to 313.2) K and the pressure range was (30 to 100) bar. The experimental data were well correlated with the Peng- Robinson equation of state using the Wong and Sandier mixing rules, and the relevant parameters are presented.

지주막하 출혈을 동반한 용혈성 요독 증후군 1례

김웅흠,김우택,이창연,김동욱,박성기,장무환 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

Hemolytic uremic syndrome is characterized by Coombs-negative microangiopathic hemolytic anemia, thrombocytopenia, and acute renal failure in infant and children. At present, E. coli 0157 : H7 and other verotoxin-producing E. coli(VTEC) seem to be a major cause of this illness. The majority of patients have a prodrome of bloody diarrhea, and acute renal failure develops several days to weeks later. Although an optimal treatment remains unknown, the general management of hypertention and renal failure with early and frequent dialysis is the mainatay of treatment, and intravenous administration of immunoglobulin G is like to be effective. We experienced a case composed of bloody diarrhea, seizures, coma, and anuria in 1 year old girl who was diagnosed as HUS and recovered renal function completely with slight impairment of cognitive ability and behavioral function. We presented this case with a review of literatures.

Plasma arc light curing unit을 이용한 광중립형 수복재의 중합양상

우연선,정태성,김신 大韓小兒齒科學會 2002 大韓小兒齒科學會誌 Vol.29 No.2

본 연구는 할로겐광과 비교하여, 고강도의 단축된 중합 시간을 장점으로 하는 플라즈마광의 효율성을 평가할 목적으로, 첫째, 중합 시간과 중합 거리에 따른 중합도의 변화를 검토, 광조사 시간을 증가시킬 경우 특정거리 이상에서도 수복물 하층까지 충분한 중합이 이루어지는지 알아 보고, 둘째, 중합 반경에 따라 균일한 중합이 이루어지는지 보기 위해 광조사 부위의 중심부와 외측 변연부의 중합도 차이를 비교하였다. 2mm 두께의 복합레진 시편의 상·하면 미세경도 측정을 통해 중합도를 비교해 본 결과, 다음과 같은 결론을 얻었다. 1. 거리증가에 따른 상대광도의 감소는 할로겐광에 비해 플라즈마광에서 그 차이가 적었다(p<0.05). 2. 플라즈마광, 할로겐광 모두 상면의 미세경도는 중합거리 2mm 이상부터 유의하게 감소되었으며, 중합시간의 증가에 따라 증가되었다(p<0.05). 3. 플라즈마광 3초를 제외하고, 하면의 미세경도 변화는 4mm 이상에서 급격히 감소하였으며, 상면에 비해 중합시간가 거리의 영향을 많이 받았다(p<0.05). 4. 플라즈마광, 할로겐광 모두 조사시간의 증가에도 불구하고 4mm 와 6mm 사이에서 하면의 미세 경도차는 비교적 크게 나타났다(p<0.05). 5. 플라즈마광을 6∼9초 적용한 때와 할로겐광을 40∼80초 적용한 때의 미세경도치 및 거리에 따른 경도 변화는 유사하였다(p>0.05). 6. 플라즈마광, 할로겐광 모두 레진 시편의 중앙에서 외측으로 갈수록 미세경도는 유의하게 감소하였다(p<0.05). The purpose of this study was to compae the dffect of distance of light tip to resin surfaces and exposure time on the polymerization of surface and 2 mm subsurface of composite resins cured with two light sources; conven-tional halogen light (XL 3000, 3M, U.S.A.) and plasma arc light (Flipo, LOKKI, France) and compare the uni-formity of polymerization from the center to the periphery of resin surfaces according to polymerization diameter cure with two light sources. From the experiment, the following results were obtained. 1. Difference of relative light intensity decrease in plasma arc light smaller than that of conventional haloger light(p<0.05). 2. In all groups, microhardness of top surfaces was decreased when distance of the light tip to resin surfaces is more than 2mm and increased according to increase of exposure time(p<0.05). 3. Difference of microhardness of the 2mm subsurface was rapidly decreased when distance of light tip to resin surfaces is more than 4mm(except, plasma arc light exposure time of 3 seconds). and the distance of light tip to resin surfaces and exposure time more affected 2mm subsurface rather than top surface(p<0.05). 4. Although exposure time was increased, difference of microhardness of the 2mm subsurface with the distance of light tip resin surfaces was relatively high in groups between below 4mm and 6 mm(p<0.05). 5. Plasma arc light exposure time of 6 to 9 seconds produced microhardness values and microhardness change according to various distance similar to those produced with 40 to 80 second exposure to a conventional halogen light(p>0.05). 6. In all groups, microhardness was decreased gradually from the center to the periphery of resin surfaces(p<0.05).

좌심방 석회화와 관련된 반복된 좌심방 혈전 1예

김성훈,우성용,오유경,정우백,임철현,신재원,박철수,윤호중,정욱성,홍순조 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.3

분광 광도법에 의한 광물중 Nickel정량에서의 Amberlite LA-1의 이용

김연두,김종우,최기영 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2

In the selective an quantitative determination of nickel by the dimethylglyoximate complexation from the ores, the undesirable impurities such as iron, cobalt and copper interfere the separation by forming the oximate complexes. To solve this problem, the extraction of these species with the liquid anion exchanger, amberlite LA-1, has been attempted. Nickel was completely separated with dimethylglyoxime in aqueous phase from the sample containing iron, aluminum, chromium, cobalt, copper, zinc and nickel after treating it with 50 ml of 5% amberite LA-1-xylene and the concentrated hydrochloric acid solution.

北漢江流域의 河系網 分析

金又寬,尹仁赫 경북대학교 사회과학대학 1983 社會科學 Vol.2 No.-

This study attempts to analyze the drainage system of the Buk-Han River basin with the purpose of examing the characteristics and presenting the data for systematizing rivers in Korea. The Drainage system is analyzed according to Bifurcation ratio and Length ratio. The research is based upon analysis of 1 : 250,000 topographical map coverage. The results are as follows: (1) The main stream is found to be 6th order. The Bifurcation ratio (N_1/N_2) is determined to be 4.1 and the Length ratio(L_2/L_1), 1.18. (2) Correlation between order and number which is plotted on the semilog paper shows characteristics of natural stream systems. (3) Correlation between order and length expresses that the junction of the 5th order leans to the lower stream.(4) The average drainage density of Buk-Han River Basin is 381m/㎢.

LRNi5-LaNi5의 수소 흡수, 방출 특성에 관한 연구

김연상,김진우 崇實大學校 生産技術硏究所 1992 論文集 Vol.22 No.-

As a fundamental research of the storage of hydrogen by using metal hydrides, the absorption-desorption characteristics of hydrogen for ??(9:1) alloys were investigated. The relation among pressure, composition and temperature was examined for the ?? alloys. As a result, we found that the maximum amount of the hydrogen absorption of ?? alloys was H/M=1.09 at 25℃. The hysteresis was the lowest at 25℃, and the plateau region was the best at 25℃. Also, we found that the velocity of the hydrogen desorption was the fastest at 35℃. The hydrides of ?? proved to be suitable for use as a stationary energy storage material because cycling life was 5500.

흰쥐 입천장발생중 laminin의 발현에 관한 연구

김원규,황우열,윤지희,백두진,정호삼 대한췌담도연구회 2000 대한췌담도연구회지 Vol.5 No.3

선천 결손으로 오인될 수 있는 하악 제2소구치의 발육지연

우연선,정태성,김신 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.3

하악 제2소구치의 선천결손은 비교적 흔히 나타나는 이상으로, 방사선사진에서 결손으로 확인되는 경우 여러가지 치료방법을 고려할 수 있다. 환자의 연령 , 제2유구치 치근의 흡수상태 , 총생의 정도, 악골의 성장, 측모의 형태 , 절치의 돌출도, 하안 모고경 등을 고려하여 치료방법을 선택하게 된다. 그러나.선천결손의 진단과 치료방법의 결정에 있어서 주의해야 할 점이 있다. 하악 제2소구치는 분화와 석회화과정에 있어서 가장 많은 변이를 보이는 치아이다. 경조직 형성은 2를∼2룰세에 시작되며, 대부분 적어도 3∼3를세에는 시작된다. 그러나, 이 시기는 다른 영구치에 비해 그 범위가 매우 넓어서 5∼6세, 드물게는 그 이후에 발육이 시작되는 경우도 있다 그러므로 하악 제2소구치의 선천결손을 조기에 진단하기에는 어려움이 있으며 선천결손으로 진단한 경우라도 오진할 가능성이 있음을 인식하는 것이 중요하다. 저자는 두 가지 증례를 통한 임상연구와 문헌고찰을 통해 다음과 같은 결론을 얻었다. 1. 두 증례 모두에서 하악 제2소구치의 두드러진 발육지연이 관찰되었다. 2.치배형성 이후의 석회화 속도는 거의 정상적으로 나타난 것을 보아, 발육지연은 석회화 과정보다는 분화과정에 있었던 것으로 판단되었다 . 3. 이와 유사한 증례를 접하였을 경우 치아의 선천결손으로 단정하기 보다는 발육지연의 가능성을 함께 고려할 필요가 있을 것으로 사료되었다. The congenital missing of mandibular second premolars is among the common dental anomaly in children. When a second premolar is diagnosed as congenitally missed, we should consider many factors influencing the treatment plan such as patient's age, states of roots of 2nd primary molar, degree of crowding, skeletal growth pattern, facial profile, procumbency of the incisor and lower facial height, etc. The mineralization of the second premolars begins in the majority of cases at the age of 2∼2½ years, but this period varies more widely than those for other permanent teeth. Also, mandibular second premolars show the greatest variations in differentiation and calcification. For this reason, aplasia of this group of teeth cannot be diagnosed at early age and with the same degree of certainty. From the clinical studies with 2 cases and some literature review on late development of second premolars, it could be summarized as follows : 1. The 2 cases showed marked delay in the development of mandibular second premolars. 2. After the crypt formation, the speed of calcification seemed nearly normal, suggesting that the delay was due to differentiation rather than calcification. 3. When one is encountered with similar conditions, it would be desirable to consider the possiblity of delayed tooth development.

GC/NPD를 이용한 다성분 잔류농약의 동시분석

김우성,이선화,김상엽,정동윤,김재이,이영자,이홍재,정성욱,박흥재 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

Pesticides were extracted from samples with 70% acetone and methylene chloride in order, and then cleaned up via open-column chromatography apparatus packed with fiorisil, and finally analyzed simultaneously the organophosphorus pesticides using GC/NPD, Ultra-2 and Ultra-1 fused silica capillary columns were used to separate and identify the products. Recovery of most analytes from soybean sample, taken from pesticide residues well, was greater than(80%) for all except(6) analytes. This method can simultaneously determine multiple pesticides with a high degree of accuracy and precision.