무증상으로 발견된 담낭-담관 누공을 동반한 Mirizzi 증후군 1예

홍진희,전태주,서지영,서동대,오태훈,신원창,최원충,신은아,김기환 인제대학교 2009 仁濟醫學 Vol.30 No.-

Mirizzi's syndrome is a rare complication of the gallstone disease, characterized by narrowing of the common bile duct (CBD) due to chronic extrinsic compression of an impacted gallstone in the cystic duct or the neck of the gallbladder. The impacted gallstone may erode into the bile duct, causing cholecystocholedochal fistula. The patients generally have history of repeated attacks of jaundice and abdominal pain. But there is no report about asymptomatic Mirizzi syndrome with cholecystocholedochal fistula which were found incidentally. So herein we present our clinical experience with a case of asymptomatic Mirizzi syndrome with cholecystocholedochal fistula in a young female.

서울시내 고등학교 위탁급식의 급식비와 투자비의 실태 및 위탁업체의 기대수준 비교 분석

양일선,배환미,김현아,신서영,조미나,박수연,차진아,이보숙 한국식생활문화학회 2002 韓國食生活文化學會誌 Vol.17 No.5

The purposes of this study were to a) find out the operational characteristics of the contract-managed highschool foodservice in Seoul, b) investigate the expected level of meal-price and facilities investment cost perceived by contract-managed highschool foodservice managers c) compare the present level and expected level of meal-price and facilities investment cost. From October 12 to November 13 in 2001, the questionnaires were mailed to 249 high schools which was managed by contract foodservice company with respondent rate 40.2%. Data were analyzed using SPSS Win(10.0) for descriptive analysis and one group paired t-test. The results of this study were as follows ; 1. The student enrollment of highschools run by contract-managed foodservice was 1,243 with 72.6% participation rate of school lunch program. The average meal-price was 2,138 won. The average annual period of school foodservice operation was 156.78 days per year. The average contracting period was about 3 years. 2. The average cost concerned in the facilities investment amounts 169,578,180 won at the initial investment and 25,204,092 won at the repairs and maintenance cost in the course of operation. 3. The present level of meal-price and facilities investment cost were respectively 2,136won/meal and 171,157,336.72 won. And expected level.of meal-price and amount of facilities investment cost were 2,418.75 won and 121,353,215.19 won. Comparing the present level with expected level of the meal-price and facilities investment cost, expected level of meal-price was significantly higher than the present level of meal-price(p<.001) and expected level of facilities investment cost was significantly lower than present level of facilities investment cost(p<.001).

인천 인현동 호프집 화재 피해자 분석

최정태,안무업,안희철,최영미,정재봉,서정열,유기철,이삼우,박석현,조준휘,김성환,김아진,송근정 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4

Purpose : This study was conducted to develop field triage, transportation, distribution, and prehospital care at a fire disaster by analyzing the victims of the fore that broke out at a bar in Incheon. Method : We analyzed the cases of the victims of a fire in Incheon in Oct. 1999. We determined the primary care hospital, the arrival time, the burn size, the outcome, and the injury type from the medical records, the concerned organ records, and interviews with concerned persons. Result : The total number of victims was 137: 56 prehospital deaths, 1 hospital death, and 80 survivals. The Pearson correlation coefficient between the burn size and the severity was -0.175. There were 121(89.6%) cases of inhalation injury, 59 (43.7%) cases of flame burns, 66 (48.9%) cases of hypoxic brain damage, and 16 (11.9%) cases involving other types of injury. Conclusion : The causes of death of the fire victims were inhalation injury and hypoxic brain damage due to CO poisoning and other toxic inhalants. We propose the use of a simple triage and rapid treatment(START) system and a reassessment the delayed category in fire disasters.

REPEATED INHALATION EXPOSURE TOXICITY TEST FOR 4 WEEKS BY USING NOSE-ONLY CHAMBER SYSTEM WITH FRESH AND MOIST AIR IN RATS

Young-Ah Han,Min-Sung Kang,Soo-Nam Kim,Jae-Hwan Kim,Jin Soo Lee,Jin-Hee Lee,Young-Soo Yang,Seong-Jin Choi,Soon-Jin Kwon,Heung-Sik Seo,Byeong-Chan Lee,Hee-Jin Yu,Jeong-Ah Song,Eun-Jung Park,Kyung Jin J 한국환경독성학회 2009 한국독성학회 심포지움 및 학술발표회 Vol.2009 No.11

Preparation and Characterization of Proton Conducting Composite Membranes From P(VDF-CTFE)-g-PSPMA Graft Copolymer and Heteropolyacid

Seo, Jin-Ah,Roh, Dong-Kyu,Koh, Jong-Kwan,Kim, Jong-Hak The Membrane Society of Korea 2008 Korean Membrane Journal Vol.10 No.1

Proton conducting composite membranes were prepared by solution blending of poly(vinylidene fluoride-co-chlorotrifluoroethylene)-graft-poly(sulfopropyl methacrylate) (P(VDF-CTFE)-g-PSPMA) graft copolymer and heteropolyacid (HPA). The P(VDF-CTFE)-g-PSPMA graft copolymer was synthesized by atom transfer radical polymerization (ATRP) using direct initiation of the secondary chlorines of P(VDF-CTFE). FT-IR spectroscopy revealed that HPA nanoparticles were incorporated into the graft copolymer via hydrogen bonding interactions. The water uptake of membranes continuously decreased with increasing HP A concentration up to 45wt%, after which it slightly increased. It is presumably due to the decrease in number of water absorption sites due to hydrogen bonding interaction between the HP A particles and the polymer matrix. The proton conductivity of membranes increased with increasing HPA concentration up to 45wt%, resulting from both the intrinsic conductivity of HP A particles and the enhanced acidity of the sulfonic acid of the graft copolymer.

Quasi solid-state dye-sensitized solar cells based on P(VDF-co-CTFE) graft copolymer electrolytes

Jin Ah Seo,노동규,Seung Hyeon Yeon,김종학,Soo Jin Byun 한국물리학회 2010 Current Applied Physics Vol.10 No.3

A graft copolymer of poly(vinylidene fluoride-co-chlorotrifluoroethylene) with poly(oxyethylene methacrylate),i.e. P(VDF-co-CTFE)-g-POEM was synthesized via atom transfer radical polymerization (ATRP)using CTFE unit as a macroinitiator. This graft copolymer was complexed with metal salt (LiI) and ionic liquid (1-methyl,3-propyl imidazolium iodide, MPII) to produce a polymer electrolyte. Low molecular weight oligomer, poly(ethylene glycol) dimethyl ether (PEGDME, 500 g/mol) was additionally introduced to enhance an ionic conductivity and cell performances. Coordinative interactions and microphase-separated structures were investigated using FT-IR spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The maximum energy conversion efficiency of the dye-sensitized solar cell (DSSC) employing P(VDF-co-CTFE)-g-POEM, PEGDME and Li + MPII reached 4.2% at 100 mW/㎠.

Poly(oxyethylene methacrylate)–poly(4-vinyl pyridine) comb-like polymer electrolytes for solid-state dye-sensitized solar cells

Seo, Jin Ah,Koh, Jong Kwan,Lee, Ki Bong,Kang, Sang Wook,Kim, Jong Hak Springer-Verlag 2012 Journal of solid state electrochemistry Vol.16 No.2

양쪽성 가지형 공중합막을 이용한 다양한 모양의 은 나노입자 제조

Jin Ah Seo,Jin Kyu Choi,Sung Hoon Ahn,Seung Hyeon Yeon,Jong Hak Kim 한국막학회 2010 멤브레인 Vol.20 No.2

Silver ions of poly(vinyl chloride)-g-poly(styrene sulfonic acid) (PVC-g-PSSA) graft copolymer were reduced to form silver nanoparticles under thermal condition (80℃). We were successful in synthesizing silver nanoparticles with various morphologies by changing reaction time. At short reaction times (~1 h), silver nanoparticles with 5 nm in size were formed without disrupting a microphase-separated structure of graft copolymer. At medium reaction times (~5 h), silver nanoparticles were aggregated to form large clusters ranging 30~50 nm in size. At much longer reaction times (~18 h), hurricane-like silver clusters were observed due to strong particle aggregation. Poly(vinyl chloride)-g-poly(styrene sulfonic acid) (PVC-g-PSSA) 가지형 공중합체를 합성한 후, 이를 이용하여 80℃에서 열적으로 환원하여 은 나노입자를 제조하였다. 반응 시간을 바꿈에 따라 다양한 구조의 은 나노입자를 제조하는데 성공하였다. 1시간 정도의 짧은 반응 시간에서는 가지형 공중합체의 미세 상분리 구조를 크게 변화시키지 않고 5 nm 크기의 작은 은 나노입자가 생성되었다. 5시간 정도의 중간 반응 시간에서는 30 내지 50 nm 정도의 크기를 갖는 은 나노입자가 생성되었다. 18시간 정도의 긴 반응 시간에서는, 은입자가 뭉친 허리케인 모양의 은 집합체가 관찰되었다.

Effective Cryopreservation Method by Controlling the Clump Size of Human Embryonic Stem Cells

( Jin Seo ),( Hye Won Seol ),( Jin Ah Baek ),( Ju Won Jung ),( Bo Ae Yoon ),( Hee Sun Kim ),( Sun Kyung Oh ),( Seung Yup Ku ),( Seok Hyun Kim ),( Shin Yong Moon ),( Young Min Choi ) 한국조직공학·재생의학회 2011 조직공학과 재생의학 Vol.8 No.4

Human embryonic stem cells (hESCs) have the potential for use in regenerative medicine and in the field of basic research. Therefore, effective cryopreservation and storage of hESCs are important for preservation of newly established cell lines for various purposes. Despite poor survival and slow recovery after thawing, the con-ventional slow freezing method is most commonly used for cryopreservation of hESCs due to its simplicity and ease of use for freezing a large number of hESCs appropriate to clinical applications. Here we controlled clump size(Group I; 400~450μm, Group II; 800~900μm, and Group III; 1500~1700μm) of hESCs at 5 days after plating using a glass pipette during cryopreservation in order to obtain a larger amount of hESCs after thawing. Attachment rates differed significantly (p<0.05) in each of the three groups and the average attachment rate of Group II was highest in SNUhES4 and H1. In particular, the attachment rate of Group II in SNUhES3 showed a significant improvement with ROCK inhibitor Y-27632. These results indicate that clump size and cell-cell adhesions of Group II are appropriate for cryopreservation compared to Group I and Group III. This method increased cell viability and reduced the recovery time leading to various experiments, and therefore has an advantage for use with hESCs like newly established in particular. We demonstrate that use of this cryopreservation method with control of the clump size of hESCs can effectively improve the attachment rate and survival of post-thaw hESCs with and without Y-27632.

가소화된 Poly(vinyl chloride)-g-Poly(oxyethylene methacrylate) 가지형 고분자 전해질막 제조 및 분석

Jin Ah Seo,Jong Kwan Koh,Joo Hwan Koh,Jong Hak Kim 한국막학회 2011 멤브레인 Vol.21 No.3

Poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) 가지형 공중합체를 원자전달라디칼 중합을 통해 합성하여 전기변색소자의 전해질에 적용하였다. 가소화된 고분자 전해질은 가소제로서 propylene carbonate (PC)/ethylene carbonate (EC) 혼합물을 도입하여 제조하였으며, Lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiCIO4), lithium iodide (LiI) and lithium bistrifluoromethanesulfonimide (LiTFSI)를 사용하여 염의 종류에 따른 영향을 조사하였다. 광각 x-선 산란(WAXS)과 시차주사 열량법(DSC) 측정 결과 고분자 전해질의 구조와 유리전이온도(Tg)가 변하였고, 이는 POEM 내의 에테르의 산소와 리튬염 사이의 상호작용으로 인해 변했다는 것을 FT-IR 분광법을 통하여 확인하였다. 투과전자현미경(TEM) 측정 결과 PVC-g-POEM 가지형 공중합체의 미세상분리 구조가 PC/EC와 리튬염의 도입에도 변하지 않는 것을 관찰하였다. 가소화된 고분자 전해질은 poly(3-hexylthiophene) (P3HT) 전도성 고분자를 이용한 전기변색소자에 적용되었다. Poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) graft copolymer was synthesized via atom transfer radical polymerization (ATRP) and used as an electrolyte for electrochromic device. Plasticized polymer electrolytes were prepared by the introduction of propylene carbonate (PC)/ethylene carbonate (EC) mixture as a plasticizer. The effect of salt was systematically investigated using lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiCIO4), lithium iodide (LiI) and lithium bistrifluoromethanesulfonimide (LiTFSI). Wide angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC) measurements showed that the structure and glass transition temperature (Tg) of polymer electrolytes were changed due to the coordinative interactions between the ether oxygens of POEM and the lithium salts, as supported by FT-IR spectroscopy. Transmission electron microscopy (TEM) showed that the microphase-separated structure of PVC-g-POEM was not greatly disrupted by the introduction of PC/EC and lithium salt. The plasticized polymer electrolyte was applied to the electrochromic device employing poly(3-hexylthiophene) (P3HT) conducting polymer.