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문은이(Eun Yi Moon),이진(Jin Lee),이원용(Won Yong Lee),최청하(Chung Ha Choi),이덕근(Dug Keun Lee),유제만(Jei Man Ryu),정용호(Yong Ho Chung),윤성준(Sung June Yoon),박경배(Kyung Bae Park) 한국응용약물학회 1997 Biomolecules & Therapeutics(구 응용약물학회지) Vol.5 No.3
DW-166HC (^(166)Holmium (^(166)Ho)-Chitosan complex) is a new radiopharmaceutic anticancer agent with a broad anti-tumorigenic spectrum, especially against human hepatic cancer. DW-166HC was evaluated for the appearance of micronucleus in polychromatic erythrocytes (PCEs) of mouse bone marrow cells after subcutaneous arid intravenous single administration. Bone marrow cells were prepared at 24 hr and 48 hr after DW-166HC-I (^(165)Ho-Chitosan complex : cold compound) administration and at 24 hr, 72 hr and 2 weeks after DW-166HC (^(166)Ho-Chitosan complex : hot compound) administration. The results showed there was no statistically significant increase of the numbers of PCEs with micronucleus in all DW-166HC-I administered groups compared with a negative control group but there was statistically significant increase of the numbers of PCEs with micronucleus at 24 hr arid 72 hr in all DW-166HC administered groups, which was recovered after 2 weeks from the drug administration. The results also showed the ratio of normochromatic erythrocytes (NCEs) to PCEs of all DW-166HC-I administered groups was not significantly different from that of a negative controi group but there was significant difference of this ratio at 24hr and 72 hr in all DW-166HC administered groups compared with that of negative group, which was also recovered after two weeks from the drug administration. These results suggested that DW-166HC-I may not cause any chromosomal damage but DW-166HC has in vivo mutagenic potential because of its radioactivity.
8년간(1992~1999) 산업안전보건연구원에 의뢰된 직업병 심의 사례 분석
강성규,김규상,김양호,최정근,안연순,진영우,최병순,양정선,김은아,채창호,최용휴,김대성,박정선,정호근 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2
Objectives : Pneumoconisis and noise-induced hearing loss (NIHL) have been reported as main occupational diseases by the Special Health Examination. The Industrial Accident Compensation Insurance has reported various work-related diseases, however, these two diseases occupied almost a half of compensated cases. Therefore, it was not well known about the status of occupational diseases other than pneumoconiosis, NIHL, and cardio-cerebrovascular accident (CVA). This study was conducted to analyze claimed cases as an occupational disease, that was requested to the Korea Industrial Safety and Health Agency (KOSHA). Methods : The local office of the Korea Labor Welfare Corporation (KLWC) has asked the KOSHA for confirmation of claimed cases as an occupational disease. We analyzed 379 cases requested from KLWC, the Ministry of Labor, employers, unions and occupational health agencies from 1992 to 1999. Results : Male was 80.7 % of the requested cases. Their mean age was 42 years old and 75.5 % of them were more than 35 years old. The requested cases were increased rapidly from 25 cases in 1992 to 108 cases in 1999 and the accept rate was 50.7 %. The majority of requested cases were respiratory diseases(22.4%), cancers(18.5%), Neuropsychiatric problems(14.5%), and musculoskeletal problems(13.5%). The accept rate was high in reproductive, respiratory, musculoskeletal and digestive disorders and low in neuropsychiatric, renal and otologic problems and occupational cancers. 73.6% of them were caused by chemical agents, especially 28.5 % were by organic solvents. 67% of them were clinically confirmed at university hospitals. A half of the cases were from KyongIn area, even the request came from the whole country. Conclusions : A claim was common in workers whose age was over 35 years old and exposure history was over 10 years. The respiratory diseases and neuropsychiatric disorders were still main problems in occupational health and occupational cancers was increasing even though its accept rate was not high yet.
수면상의 지방산 단분자 Langmuir막의 Maxwell 변위 전류
朴根浩 昌原大學校 基礎科學硏究所 1997 基礎科學硏究所論文集 Vol.9 No.-
Maxwell displacement current(MDC) measuring technique has been applied on the study of monolayers of long chain fatty acid. The displacement current was generated from monolayers on the water surface by monolayer compression and expansion. Displacement current was generated when the area per molecule was about 130Ų. MDCs were investigated in connection with monolayer compression cycles. It was found that the curremt pulses were generated over the entire range of molecular area, and the maximum of MDC appeared at the molecular area just before the initial rise of surface pressure in compression cycles.
Styrene과 2-Hydroxypropylacrylate(2-HPA) 공중합 특성
박근호,정영언,김남석,설수덕,서영옥 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-
Solution copolymerization of Styrene(St.) with 2-Hydroxypropylacrylate(2-HPA) was carried out with Benzoylperoxide(BPO) as an initiator in toluene at 80℃ in a batch reactor. Reaction volume and reaction time were 0.3 liters, 7hours respectively. The time to reach steady state was about the six time. The monomer reactivity ratios, r1(St.) and r2(2HPS) were determined by both the Kelen-Tudos method and the Fineman-Ross method : r1(St.)=0.376(0.330), r2(2-HPA)=0.408(0.778). The activation energy of thermal decomposition was in range of 33∼55 kcal/mol.
박규태,이상범,류근호 연세대학교 산업기술연구소 1985 논문집 Vol.17 No.1
In distributed databases, deadlock may occur due to conflicts in data file lockings. A system is in a deadlock if and only if there is a directed cycle in its demand graph. This paper presents a distributed deadlock detection technique based on transaction wait for graph and reachable set. Reachable set constructs transaction resource graph and detects the deadlock cycle effectively. In this deadlock detection procedure, the deadlock is detected optimally, but there are still some problems of false deadlock due to communication delay. Also studies are made the low cost recovery of the deadlock and their performances.
디메틸 프탈레이트와 에틸렌 글리콜의 에스테르 交換反應에서의 觸媒活性에 關한 硏究
朴根浩 國立 昌原大學校 産業技術硏究所 1991 産技硏論文集 Vol.5 No.-
Transesterification reaction between dimethly phthalate and ethylene glycol was kinetically investigated in the presense of various metal acetate catalysts at 185℃. The reaction rates measured by the amount of distilled methanol from the reaction vessel. The transesterification reaction was carried out under the first order conditions respect to the concentration of dimethyl phthalate, ethylene glycol and catalyst, respectively. The over-all order was 3rd. Maximum reaction rate was appeared at the range of 1.2 to 1.7 in electronegativity of metal ions and maximum catalytic activity was appeared at the range of 1.4 to 1.6 in instability constant of metal acetates.