6MV 전자 선형 가속기 광자선의 전자오염

유명진,김동원,정운혁 대한방사선 방어학회 1988 방사선방어학회지 Vol.13 No.1

부산의대 부속병원의 전자선형가속기 (Mevatron 67) 장치를 이용하여 표면선량의 원인이 되는 광자선의 전자오염에 대한 연구를 하였다. 표면선량은 조사야의 크기에 따라 증가하는 경향을 나타내었다. 빔내에 트레이를 설치했을 때와 트레이를 제거했을 때 표면선량의 변화와 전자오염정도을 관찰하였다. 전자오염을 감소시키기 위해서 구리 필터를 트레이 밑에 부착하여 그 효과를 분석하였다. 아울러 거리를 변화시켜가며 선량의 변화를 관찰하여 최대의 피부보호효과를 유지할 수 있는 최적의 SSD와 TSD를 구하였다. 이런 모든 결과들은 방사선 치료환자의 피부보호에 이용될 것이다. The 6 MV photon beam of a linear accelerator (Mevatron 67) was studied for electron contamination. The surface dose, attributable almost entirely to contamination electrons, has a linear dependence on field width for square fields and an inverse square dependence on distance from the bottom of the fixed head assembly. Build-up and surface dose measurements were taken with and without an acrylic blocking tray in place. Further measurements were made with a copper filter designed to reduce secondary electrons emitted by photon interactions with the acrylic tray. The results are discussed in relation to skin sparing effect for radiation therapy patients. To achieve the maximum skin sparing effect, the selection of the optimum SSD and TSD is needed.

각이등분법 및 평행법에 의한 전악구내 표준 촬영시 두경부 피부 흡수선량 비교

유명진,김현자,도시홍,나경수,김애지 大韓口腔顎顔面 放射線學會 1990 Imaging Science in Dentistry Vol.20 No.2

This study was performed to measure the skin absorbed doses from full mouth standard intraoral radiography(14 exposures) in bisecting angle and paralleling techniques. Thermoluminescent dosimeters were used in a phantom. Circular tube collimator(60mm in diameter, 20cm in length) and rectangular collimator(35mmX44mm, 40cm in length) were set for bisecting angle and paralleling techniques respectively. All measurement sites were classified into 8 groups according to distance from each point of central rays. The results were as follows: 1. The skin absorbed doses from the paralleling technique were significantly decreased than those from the bisecting technique in both points at central ray and points away from central ray. The percentage rates of decrease were greater at points away from central ray than those at central ray. 2. The skin absorbed doses at the lens of eye, parotid gland, submandibular gland and thyroid region were significantly decreased in paralleling techniuqe, but those of the midline of palate remained similar in both techniques. 3. The highest doses were measured at the site 20mm above the point of central ray for the mandibular premolars in bisecting angle technique and at the point of central ray for the mandibular premolars in paralleling techniques. The lowest doses were measured at the thyroid region in both techniques.

大型建築物의 中水道設置에 對한 妥當性 硏究

安承丘,柳明辰,朴鍾雄 서울市立大學校 1985 論文集 Vol.19 No.-

The purpose of this study is to clarify present status, effects, problems and overall aspects of the recycled water supply system, and to analize economics of watewater reuse. Based on the results, the following conclusions may be drawn; 1. The cost of the recycled water supply system is about two times as much as the conventional wastewater treatment cost, and it is about two to five times as much as the residertial water supply and drainage charge. 2. In a large-sized building with water consumption above 500㎥/d, the water supply and drainage charge is higher than the recycled water supply cost. Therefore, it may be recommended to introduce the recycled water supply system. 3. In order to promote wastewater reuse, the cost for the recycled water supply should be lower than the water supply and drainage charge. It may be accomplished by lowering the public utility fee basis for the treatment and developing new water treatment technologies. 4. The cost of ground water use is lower than the recycled water cost. But continuous pumping of ground water may cause sinking problems. Therefore, the wastewater recycling may be favorable to alleviate the water supply shortage in the down-town area.

AlcyonCo-60 감마선의 전자오염

유명진(Meong-Jin Yoo)·김동원(Dong-Won Kim)·김철수(Chul-Soo Kim)·정운혁(Woon-Hyuk Chung) 대한방사선종양학회 1988 Radiation Oncology Journal Vol.6 No.1

The Alcyon Co-60 gamma rays was studied for electron contamination. The surface dose, attributable almost entirely to contamination electrons, has a linear dependence on field width for square fields and an inverse square dependence on distance from the bottom of the fixed head assembly. Build-up and surface dose measurements were taken with and without an acrylic blocking tray in place. Further measurements were made with a copper filter designed to reduce secondary electrons emitted by photon interactions with the acrylic tray. The results are discussed in relation to skin sparing effect for radiation therapy patients. And to achieve the maximum skin sparing effect, the selection of the optimum SSD and TSD is needed.

Expression of carbonic anhydrase 12 in cervical cancer is associated with differentiation status and superior radiotherapy outcome(초)

( Chong Woo Yoo ),( Byung Ho Nam ),( Sun Lee ),( Hye Jin Shin ),( Hyun Sun Lim ),( Su Kyoung Lee ),임명철 ( Meong Cheol Lim ),( Yong Jung Song ),( Joo Young Kim ) 대한산부인과학회 2009 대한산부인과학회 학술대회 Vol.95 No.-

Transcriptional regulation of the <i>Drosophila ANT</i> gene by the DRE/DREF system

Kim, Young Shin,Shin, Meong Joo,Yang, Dong Jin,Yamaguchi, Masamitsu,Park, So Young,Yoo, Mi Ae Blackwell Science Ltd 2007 Genes to cells Vol.12 No.5

<P>Adenine nucleotide translocase (ANT) is a crucial component in the maintenance of cellular energy homeostasis, as well as in the formation of the mitochondrial permeability transition pores. However, the molecular mechanisms regulating the expression of the <I>ANT</I> gene are poorly understood. In this study, we have identified three DNA replication-related elements (DRE; 5′-TATCGATA) in the 5′-flanking region of the <I>Drosophila ANT</I> (<I>dANT</I>) gene. Gel-mobility shift analyses revealed that all three of the DREs were recognized by the DRE-binding factor (DREF). The site-directed mutagenesis of these DRE sites induces a considerable reduction in the activity of the <I>dANT</I> gene promoter <I>in vitro</I>. Analyses with transgenic flies harboring a <I>dANT-lacZ</I> fusion gene bearing the wild-type or mutant DRE sites showed that the DRE sites were required for the expression of <I>dANT in vivo</I>. We determined that the over-expression or knockdown of DREF exerts a regulatory effect on the activity of the <I>dANT</I> promoter. In addition, we observed the collapse of mitochondrial membrane potential in the eye imaginal discs in which DREF was over-expressed. These results show that DRE/DREF is a crucial regulator of <I>dANT</I> gene expression, and also suggest the possibility that cross-talk may occur between the DRE/DREF system and mitochondrial functioning.</P>

Alcyon Co-60 감마선의 전자오염

유명진,김동원,김철수,정운혁,Yoo Meong-Jin,Kim Dong-Won,Kim Chul-Soo,Chung Woon-Hyuk 대한방사선종양학회 1988 Radiation Oncology Journal Vol.6 No.1

The Alcyon Co-60 gamma rays was studied for electron contamination. The surface dose, attributable almost entirely to contamination electrons, has a linear dependence on field width for square fields and an inverse square dependence on distance from the bottom of the fixed head assembly Build-up and surface dose measurements were taken with and without an acrylic blocking tray in place. Further measurements were made with a copper filter designed to reduce secondary electrons emitted by photon interactions with the acrylic tray. The results are discussed in relation to skin sparing effect for radiation therapy Patients. And to achieve the maximum skin sparing effect, the selection of the optimum SSD and TSD is needed.

Hematopoietic stem cell transplantation in children with acute leukemia: similar outcomes in recipients of umbilical cord blood versus marrow or peripheral blood stem cells from related or unrelated donors

Yi, Eun-Sang,Lee, Soo-Hyun,Son, Meong-Hi,Kim, Ju-Youn,Cho, Eun-Joo,Lim, Su-Jin,Cheuh, Hee-Won,Yoo, Keon-Hee,Sung, Ki-Woong,Koo, Hong-Hoe The Korean Pediatric Society 2012 Clinical and Experimental Pediatrics (CEP) Vol.55 No.3

Purpose: This study compared outcomes in children with acute leukemia who underwent transplantations with umbilical cord blood (UCB), bone marrow, or peripheral blood stem cells from a human leukocyte antigen (HLA)-matched related donor (MRD) or an unrelated donor (URD). Methods: This retrospective study included consecutive acute leukemia patients who underwent their first allogeneic hematopoietic stem cell transplantation (HSCT) at Samsung Medical Center between 2005 and 2010. Patients received stem cells from MRD (n=33), URD (n=46), or UCB (n=41). Results: Neutrophil and platelet recovery were significantly longer after HSCT with UCB than with MRD or URD ($p$ <0.01 for both). In multivariate analysis using the MRD group as a reference, the URD group had a significantly higher risk of grade III to IV acute graft-versus-host disease (GVHD; relative risk [RR], 15.2; 95% confidence interval [CI], 1.2 to 186.2; $p$=0.03) and extensive chronic GVHD (RR, 6.9; 95% CI, 1.9 to 25.2; $p$ <0.01). For all 3 donor types, 5-year event-free survival (EFS) and overall survival were similar. Extensive chronic GVHD was associated with fewer relapses (RR, 0.1; 95% CI, 0.04 to 0.6; $p$ <0.01). Multivariate analysis showed that lower EFS was associated with advanced disease at transplantation (RR, 3.2; 95% CI, 1.3 to 7.8; $p$ <0.01) and total body irradiation (RR, 2.1; 95% CI, 1.0 to 4.3; $p$=0.04). Conclusion: Survival after UCB transplantation was similar to survival after MRD and URD transplantation. For patients lacking an HLA matched donor, the use of UCB is a suitable alternative.

Determination of Atmospheric Perfluorocarbon Background Concentrations of fL/L Range at the Western Coastal Area of Korea

Kim, Hye-Kyeong,Yea, Sun-Kyung,Ro, Chul-Un,Lee, Chong-Bum,Jang, Meong-Do,Lee, Gang-Woong,Yoo, Eun-Jin,Han, Jin-Seok Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.2

As part of perfluorocarbon (PFC) tracer release experiment conducted at the western coastal area of Korea in February 2001, the background concentration level of perfluorocarbons (PFCs) in the atmosphere was determined by gas chromatography with electron capture detector. Prior to the PFC tracer release experiment in the field, air samples were collected using active samplers and the background concentrations of PFCs were determined. The concentrations of perfluoromethylcyclohexane ($C_7F_{14}$, PMCH) in the western coastal area of Korea were in the range of 5.8-8.7 fL/L. The mean concentration of the PMCH in the region exhibited no significant spatial and temporal variations. This concentration level is somewhat higher and has larger standard deviation than those of studies previously conducted in USA and Europe on the background concentration levels of PFCs. Because the background concentration of PMCH in Korea is still very low and consistent temporally and spatially, the PMCH tracer can be used suitably for the studies of long-range atmospheric transport.