Influence of Al2O3 Content and Cooling Rate on Crystallization in Fe2O3–CaO–SiO2–Al2O3 Systems

Tae Jun Park,Joon Sung Choi,Dong Joon Min 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9

The behavior of silico-ferrite of calcium and aluminum (SFCA) phases and the influence of sintered ore quality were investigatedusing a confocal laser scanning microscope to understand how the Al2O3content of iron ore affects the sintered orestructure and the crystallization behavior of SFCA in a Fe2O3–CaO–Al2O3–SiO2 pseudo-quaternary system. The experimentalresults were used to inform simulations of the heterogeneous dynamic behavior in response to the rapid temperature changesand various chemical compositions typically encountered in actual sintering processes. Increasing the Al2O3content in theFe2O3–CaO–Al2O3–SiO2 pseudo-quaternary system led to the hematite content decreasing, which affects the reducibilityof the sintered ore. The correlation between the creation of SFCA and the cooling effect associated with varying the Al2O3is discussed in detail.

A Study on the Functionality of Halophytes from Coast area of Jeollanam-do

Tae-Man Ha,Yang-Joon An,Mi-Yeong Shin,Sook Park,Hak-Jae Park,Hyo-Jeong Kang,Su-Jeong Choi,Jae-Yeong Yu,Ji-Yun Jeon,Gyu-Yeon Oh 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10

This study was undertaken to improve the perceived value of halophytes and contribute to the activity of the local economy by analyzing the antioxidant activity and mineral content of Suaeda japonica, Tetragonia tetragonoides, and Spergularia marina that grow wild on the mud flats and coastal areas. The total phenolic compound content found in each order is as follows: Suaeda japonica (3.674∼5.989 mg TAE/g dry wt.), Tetragonia tetragonoides (2.515∼4.471 mg TAE/g dry wt.), and Spergularia marina (2.450∼4.067 mg TAE/g dry wt.); DPPH radical scavenging and ABTS cation radical scavenging activities were also recorded in the same order. In the case of minerals, Iron(Fe) was relatively high in Suaeda japonica (960.1∼1,346.7 mg/kg), Manganese(Mn) in Tetragonia tetragonoides (197.1∼574.8 mg/kg), and Zinc(Zn) was relatively high in Spergularia marina (63.19∼216.56 mg/kg). It was confirmed that the mineral content of Suaeda japonica, Tetragonia tetragonoides, and Spergularia marina was significantly higher than that of Chinese cabbage, lettuce, leek, and spinach.

혈중 및 호기 일산화탄소를 이용한 일산화탄소 헤모글로빈 농도간의 관련성 연구

김형수,박태혁,손지언,정갑열,김정만,김준연 동아대학교 2001 大學院論文集 Vol.26 No.-

This study was conducted to find a correlation between blood COHb and calculated COHb with expiratory air and related variables such as occupational and smoking factors. Author selected 69 healthy workers in 8 workplaces suspected CO exposure. Basic informations were collected by self-reported questionnaire and medical history taking. Author measured Indirect COHb concentration with expiratory air using Micro II-Smokerlyzer and blood COHb concentration using Oxymeter. The results of the study were summarized as follows : 1. In the smoker, mean blood COHb and calculated COHb with expiratory air were 2.21±0.98% and 2.27±0.97 %, and there was not a statistically significant difference. In the non-smoker, mean blood COHb and calculated COHb with expiratory air were 0.42±0.43 % and 0,65±0.30 %, and there was also not a statistically significant difference. 2. There were positive correlations between blood COHb and calculated COHb with expiratory air in both the smoker (r=0.91, p=0.0001) and non-smoker (r=0.73, p=0.0001). 3. In the smoker, the factors affected COHb were total smoking index (Pack × years) and passed time after the last smoking. 4. In the nonsmoker, the parking and driving groups had higher COHb concentration than others (p<0.05). In conclusion, there was no significant difference between indirect COHb concentration with expiratory air using Smokerlyzer and blood COHb concentration and there was a highly significant correlation between indirect and blood COHb concentrations. Therefore indirect COHb concentration with expiratory air is a useful screening method for CO exposure. Author suggest the resection of smoking during at least 90 minutes before measuring COHb concentration in order to exclude smoking effects.

당뇨병 환자에서 발생한 대장 가성폐색증 1예

이재형,강준구,박준성,이창범,박용수,김동선,함준수,김태화,안유헌,박충기 대한당뇨병학회 2002 임상당뇨병 Vol.3 No.2

가성 장폐색은 기계적인 폐색부위가 없이 복부팽만과 구토 등 장폐색의 증상과 징후가 나타나는 질환을 말하며, 선행원인을 찾을 수 없는 원발성 가성 장폐색과 다른 질환에 이차적으로 발생하는 속발성 가성 장폐색으로 나눌 수 있다. 당뇨병은 잘 알려진 속발성 가성 장폐색의 원인이지만 실제로 당뇨병에 의한 가상 장폐색의 발생 빈도는 매우 드문 것으로 보이며, 가성 장폐색의 적절한 치료에 대해서는 아직 논란이 있다. 저자들은 2형 당뇨병 환자에게 대장에 국한된 급성 가성 장폐색을 진단하고 보존적 치료를 시행하여 호전된 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Colonic pseudo-obstruction is a disorder characterized by gross dilatation of the colon in the absence of any anatomic lesions, which obstructs the flow of the intestinal contents. Diabetes is a well known cause of secondary pseudo-obstruction but its prevalence in rare and not well understood. A 59-year-old woman patient was admitted due to abdominal distension and nausea of a day's duration. She was diagnosed with diabetes 15 years ago, but the condition had been poorly controoled. On the abdominal radiographs, there were marked small and large bowel dilatation with the, exception of the descending colon. Our initial diagnosis was mechanical obstruction, but the possible causes were not found. Also, we could not find another cause of the secondary pseudo-obstruction, with the exception of diabetes mellitus. Thus, she was diagnosed with a diabetes induced intestinal pseudo-obstruction. The colonic dilatation was resolved by conservative management and she became comfortable in 10 hospital days, and was subsequently discharged.

토끼에서 근육주사시 입자 크기에 따른 amoxicillin의 비교 약물동태학

박승춘,윤효인,오태광,장범수,배순이,조준형,정상희,이내경,김민규 충남대학교 수의과대학 동물의과학연구소 1998 動物醫科學硏究誌 Vol.6 No.-

To investigate the pharmacokinetic difference between the two amoxicillin (AMX) particles in rabbits after intramuscular injection (i.m.), both of AMX-S (particle size: 10 ㎍) and AMX-L (particle size: 100 ㎍) were injected into New Zealand White rabbits (1.2±0.3 ㎏) at a dose rate of 10 ㎎/㎏ of body weight. In this study, serum AMX concentrations were detected by microbiological assay with E. coli BE 1186 which shows high antibiotic sensitivity. After i.m. administration, AMX-S and AMX-L were best fitted as 1-compartment model with the absorption and elimination phase. The biological half-life (T_1/2, _k10) of AMX-S is 4.06±1.09 h and that of AMX-L 4.76±0.69 h. The serum maximal concentration time (T_max) of AMX-S and AMX-L were 0.88±0.17 h and 0.77±0.11 h, respectively. Maximal AMX concentration (C_max) (AMX-S: 5.71±0.62 ㎍/㎖, AMX-L: 5.04±0.25 ㎍/㎖) in serum showed a significant difference (p<0.05). In terms of bioequivalance, however, there was no difference between the two AMX's after i.m. injection in the basis of C_max and AUC.

인터넷 이용자 유형이 인터넷 광고에 미치는 영향에 관한 연구

박태준,조재립 경희대학교 산학협력기술연구원 2001 산학협력기술연구논문집 Vol.7 No.-

The Internet is the fastest growing medium in the 90's with 25million users with a average estimated growth of 10-20% per month. It is feedback and interaction possibilities enable advertisers and Internet users to be customer and differentiate the advertisement to met user's own requirements. Its distribution opportunity is especially is suitable for the companies can benefit by building a brand image to establish a userlink or simply to learn about interactive media. Therefore, the purpose of this study is to find out the relation between the Internet advertising which would work as the leading media in corporations' marketing communications and the Internet user characteristics, and to show the evaluations of each type of advertisement by Internet user characteristics.

전이금속 Carbene 착물의 (4+2) 고리첨가반응에 대한 분자궤도함수론적 연구

박성규,김준태 조선대학교 기초과학연구소 1991 自然科學硏究 Vol.14 No.1

Methyl acrylate 유도제와 Fischer형 전이금속의 carbene 착물들의 (4+2) 고리첨가반응에 대한 반응성과 배향선택성을 예측하였다. 열적 Diels-Alder 반응을 고찰하기 위하여 FMO 이론을 적용하였으며 EHT-spd 방법으로 계산하여 고찰하였따. 1) 위 반응은 diene HOMO-dienophile LUMO 상호작용이 반응성과 배향선택성을 지배하는 normal electron demand reaction이다. 2) methyl acrylate의 산소를 (CO)_5Cr, (CO)_5Mo, (CO)_5W로 치환하면 Fischer형 전이금속의 carbene 착물의 HOMO, LUMO 에너지가 감소하고 반응성은 증가한다. 3) 주 배향체는 파라 이성체인데 이는 Fischer형 전이금속의 carbene 착물의 LUMO 계수가 metyl acrylate 유도체의 LUMO 계수보다 더 크게 분극되었기 때문이다. This paper aims to predict the reacitivity and regioselectivity of (4+2) cycloaddtion reaction of methyl acrylate derives and Fischer type transition metal carbene complexes. Frontier orbita-1 theory has been applied to thermal Diels-Alder reaction by means of EHT-spd method. It has been found that : 1) The above reaction is normal electron demand reaction that diene HOMO-dienophile LUMO interaction controls the reactivity and r-egioselectivity of this reaction. 2) When the oxygen atom of methyl acrylate is substituted with (CO)_5Cr, (CO)_5Mo and (CO)_5W, HOMO and LUMO energies of Fischer type transition carbene complexes are reduced and the reactivity is on the increase. 3) The major regioisomer is predicted as para isomer, as LUMO coefficients of Fischer type transition carbene complexes is polarized more than that of methyl acrylate derivatives.

흰쥐에서 방광경부 부분폐쇄의 제거가 방광근의 수축력에 미치는 영향

김준철,윤재영,황태곤,박용현,김광명 大韓泌尿器科學會 1997 Korean Journal of Urology Vol.38 No.12

인유두종 바이러스 양성 및 음성 침윤성 자궁경부암종에서 p53, p21, mdm2 단백의 발현

박인서,한혜승,김태숙,한지영,김준미,주영채,황태숙 대한병리학회 2001 Journal of Pathology and Translational Medicine Vol.35 No.3

성악골 절제후 유리피판술을 이용한 상악재건 3례 보고

박정일,한태근,최준,백세민 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.1

Malignant tumor of the head and neck can be treated by radical excision of the lesion. But the resultant facial deformity acts as a handicap in the patient's life. The quality of life is as important as the quantity. Therefore reconstruction of these patients is an important field in plastic surgery. We used 3 kinds of flap for reconstruction after maxillectomy. Two cases were late reconstruction with Rectus Abdominis myocutaneous free flap and parascapular free flap respectively. In remaining one case, immediate reconstruction was performed with rib bone graft and Latissimus Dorsi free flap. The results were satisfactory. But we found that ptosis of the flap is problem in all cases.